Polymer 80 rear rail problem. If your holes are drilled right .
Polymer 80 rear rail problem Apr 29, 2023 · Compatible with Polymer 80 PF940V2/PF940C/PF940V2 ROOK Tacticals Precision Machined Rear Rail System. We also carry Rook Tactical's other parts parts designed for GLOCK® pistols. Also worth nothing that I sanded both my locking block and rear rails down until the gun was butter smooth. So far they haven't replied so I thought maybe people here would offer their thoughts. There is videos out there how to troubleshoot them from MGB on odysee. Jun 26, 2024 · Improve your Polymer80 P80 compact frame with the SPLIT FRONT RAIL UPGRADE FOR POLYMER80. The most common mistake you can make, that leads to a bunch of other possible issues, is raising your rear holes, instead of lowering your rear rail. For good measure there's no hole in the jig so I couldn't drill it even if I wanted to. In that time I've spoken to both Shannon and Mark there and they both agreed that the frame and the locking block should be replaced. Nov 19, 2022 · Building a Polymer 80 is a fun and rewarding experience. No drilling necessary. The Sub-Compact kit includes the Locking Block Rail System, Rear Rail Module, 2 pins (including the 2mmx24mm Subcompact Pin), and the Round Slide Lock spring. JB Weld is a great way to fix any mistakes while building your frame. 3D gun builder covers the best-hidden Polymer 80 build tips and tricks to successfully complete your first build. May 2, 2020 · All that assumes that the problem is stemming from rear rails riding too low. Yes, that last one is glue, don’t worry, it works way better than I imagined it would. Jan 8, 2019 · Lubing and working the slide per P80 advice has not helped. I also used Flitz to polish the inside rail channels of the slide. With p80s I’ve only ever had 2 issues out of like 15 builds concerning the rails. Feb 1, 2018 · In my experience, you want the tops of the rear rails to be approximately flush with the top of the polymer rear wall. 45-cal P80 build enjoys a reliable slide that cycles smoothly. Parts Used: Polymer 80 Glock 19 kit Lone Wolf P80 lower parts kit OEM Glock 19 Slide completion kit P80 G19 Slide CMC precision barrel The Problem: When I would pull the trigger, it would take a few seconds for the gun to actually “fire. Without knowing more details I’d guess you have two issues going on. I haven’t shot it yet but no glaring issues. Oct 15, 2025 · Ultimate Polymer 80 Troubleshooting Guide Today we’re going to cover the common problems some people face with their Polymer 80 PF940C / PF940V2 Build. 85% of kits need the rear rail lowered. Apr 22, 2018 · I had no problem with the rear rails so that's good news. Racked 10 times, filed the witness marks. This kit includes the Locking Block Rail System, Rear Rail Module, and 2 different Pins. ROOK Tactical Rear Rail System Compatible with POLYMER 80 PF940 V2/C/SC Out of stock Quick View NOW AVAILABLE IN DLC AND TiN The rear rails and front locking block are more to specs on the SS80 then the Polymer80 pf9ss rear rail and front locking block hence why everyone always needs to do rail work on all there P80 builds. [ARCHIVED THREAD] - Polymer 80 problems--- a fix that might not be a fix. The ROOK Tactical Rear Rail System is precision-cut from billet 17-4 stainess steel, ensuring a perfect fit with perfect slide The problem I saw with this approach was that the rear rail module seats perfectly against the frame as is (fig 2 arrows), and I would have to evenly remove material from the entire mating surface. This actually provided somewhat of a decent solution. Learn everything P80 rails. May 18, 2017 · So P80 sent me another rear rail module, but the problem was the same. I personally like the regular “frame textured” which is already light years better than a stock The problem with stock p80 rails most of the time is with the rear rails, the front are not as bad. In my opinion - the rear rails on these suckkkk and are of somewhat poor quality/poor tolerances. Any rails that are protruding above the rear block are defective. While you can’t go full out with a Dremel to finish the frame (you will remove too much polymer once close to the jig), you can start with the Dremel tool. I don't know if someone was drunk on the job when designing this feature or what. The wait is over! You can now purchase our latest rails for your PF-Series pistol frame. This one worked! When I initially installed the slide, there was significant binding at the rear rails. 2. It also had another effect PF-Series Rail Kit The wait is over! You can now purchase our latest rails for your PF-Series pistol frame. This problem is fairly common, and the issue is discussed on MGB’s blog Rear rail fixes. The rear rail module holes did not line up (Fix: dremel out the holes to fit) 2. Designed to simplify installation and improve build success, this innovative system divides the front rail locking block into three precision-machined components, making it easier than ever to complete Jan 6, 2019 · I had similar problems to yours. Pre-Build Checklist & Common Fixes. This caused two issues - the slide was a beast to remove and it didn't want to go completely into battery when firing. The kits include the Locking Block Rail System, PF45 Rear Rail Module, 2 pins, and a slide stop round coil spring. Machined from solid Billets of the same 17-4 material as our front locking blocks, these high quality precision rails are designed to work in Tandem with the ROOK Tactical Front Locking Blocks to make for easier slide fitment and a more precise slide action. One sees light instead of solid contact along the front and rear rails. This ensures your trigger maintains a crisp, consistent feel without the need for filing, grinding, or additional tuning. The kits include the Locking Block Rail System, Rear Rail Module, and 2 pins. The kits include the Locking Block Rail System, Split Rear Rail Module, and 2 pins. The metal that you can see through the hole basically needs to go away. Why a Polymer80 Pistol Frame? Compatible with GLOCK® Gen 3 components Made from weapons-grade Polymer Double under-cut trigger guard Extended beavertail for better control On the Rear Rail Module (the stainless steel rear rails), slide that around the Glock frame parts kit’s Trigger Mechanism Housing (not included as part of this kit) and install using the second pin that is included with the kit. A way to visualize the problem is by placing a straightedge on the rails. Oct 28, 2018 · I had a similar problem with my rear pin. Several days ago I opened a ticket at P80. The P80 AFT Kit contains all the necessary components to build a complete PFC9 pistol, including a frame kit, complete slide assembly, complete frame parts kit, magazine and a pistol case. Finally got it in by putting just a touch of a bevel to the one end of the pin. I see it asked multiple times a day in building groups. Hopefully that helps POLYMER 80POLYMER80 76% BRIDGE FRAME GCA COMPLIANT COMPACT G19 / G23 - FRAME, PINS, REAR RAIL - CERAKOTE CRIMSON RED Jul 24, 2021 · As with most 80% kits, the Freedom Wolf comes with the tools needed to make a complete stripped frame. ” The trigger would reset after cycling but same Upgrade your Polymer80 PF45's sticky slide with a precision Rear Rail. Tactical and Defense Items for the discerning shooter with a primary focus on upgrade items for 80% Polymer Pistol Chassis and Glocks. The problem is not the frame, it may be the angle of the hole or out of spec parts. How to fix misaligned holes 5. Polymer 80 and 80% arms when available. The fix is to file open the hole in the rear rail. Watched several videos before building that addressed more commonly know problems and made sure to sand down the metal slide parts before completing my build. Used Machined from high-quality stainless steel with incredibly tight machining tolerances, ROOK's Rear Rail Module provides perfect alignment and lock-up for your P80 slide. The very front hole comes from Poly 80 already in place. Designed with innovation and convenience in mind, this rail system features both split front and rear rail modules, which make installation easier and more efficient. Polymer 80 trigger issues – Trigger not resetting Polymer 80 Slide Issues- How to fix a rough slide action How to fit the Polymer80 Rail sections How to fix misaligned holes How to Level the rear rails Custom Glock 19 Magwells that fit Mar 16, 2020 · The locking block fit is good, as it goes in about 80% by finger pressure alone, and just requiring a few light taps with a plastic hammer to fully seat it. The issue is the ledge doesn't allow the slide to fully seat. Each Polymer80 frame includes a stainless steel locking block rail system (LBRS) and stainless drop-in rear rail module (RRM) for installing your slide after fabrication. Machined from solid Billets of the same 17-4 material as our front locking blocks, these high quality precision rails are designed to work in Tandem with the ROOK Tactical Front Locking Blocks PF-Series Rail Kit The wait is over! You can now purchase our latest rails for your PF-Series pistol frame. Perfect for replacing worn parts or upgrading your P80 build, this rear rail delivers consistent performance shot after shot. Enhance durability and performance with this easy-to-install upgrade. Apr 25, 2018 · I also do not own any non glock made mags. ROOK Tactical's PF45-Compatible, Precision Machined Rear Rail System is the ticket to ensuring your . Marine Gun Builder will cover everything you need to get a perfect Polymer 80 Glock build for your polymer80 pfc940, polymer80 pf45, polymer80 pf940v2, polymer80 pf940cl, polymer80 glock 21sf, or the p80 pf940sc The rear rails and extractor also have been secured by roll pin in the proper fashion so I’m very confused about where I went wrong. The holes were in the wrong place. I didn't know that a new trigger housing has to be modified to fit the large frame Polymer 80 when I put this one together, so the trigger housing seated a little high on the left rear. The second issue is the slide stop has a sort of plastic ledge built into the frame. I used a file and slowly filed the witness marks. 1- rear rails need to be made 90 degrees and are therefore keeping your slide artificially high. Yes, both locking block and rear rails were completely seated in the lower, and there wasn't any debris from the finishing process blocking them from being fully seated. I have only gotten 1 kit and did not have a single issue whatsoever. Custom May 30, 2024 · 3D Gun Builder discusses P80 (Polymer 80) rails, installation, after market options, and details. 2- takedown slot needs shimming Mar 14, 2022 · Compatible with Polymer 80 PF940V2/PF940C/PF940V2 ROOK Tacticals Precision Machined Rear Rail System. The P80 Rail Kit is more than just a set of rails—it’s a performance-enhancing upgrade that supports the integrity and functionality of your Polymer 80 pistol. This means you'll enjoy a smooth pistol with more reliable cycling and ejection during rapid fire. 99 - $137. Polymer80 rear rails (again) There are many posts on reddit complaining about crappy Polymer80 rear rails,some of them 5 years old. One PF940SC is compatible with G26, G27. 50 View Details Oct 7, 2024 · I just finished my Polymer 80 G19 and was very happy with the drilling (used a dremel press for the pins) also dyed from grey to black. Oct 3, 2025 · Polymer 80 Troubleshooting // TUTORIAL Today we’re going to cover the common problems some people face with their Polymer 80 PF940C / PF940V2 Build. For me, the problem was the slide rails. Otherwise grind off some material from the rear rail assembly in that spot. I know I drilled my holes straight because I can put the trigger housing in with the pin, no issue. I suspect the rear 'rails' are the primary problem as they aren't lined up correctly with the front rails (a known issue with one solution), however we need to know if you followed the instructions to the letter or if you did like so many others did and do some extra hole drilling after putting the rear rail/trigger housing group in. Take your Polymer80™ build to the next level with the Split Front and Rear Rail Kit, engineered specifically for the PF940C compact frame. I had polished the rails with Flitz before the first test firing, but after the problems, I removed the front and rear blocks and sanded all the rail surfaces (front and back) with a 400/1000 whetstone. com Nov 6, 2019 · Polymer 80 Glock Build Rear Rail FixesMarine Gun Builder illustrates how to correct and troubleshoot your Polymer 80 Glock Build and the most common issues with the rear rail system. If your holes are drilled right 80% ARMS P80 COMPACT G19 / G23 - COMPLETE RAIL SET MPN: 80PA-P80RK-C Take your P80™ building experience to the next level with innovative split rear and front rail system designed for the PF940C compact frame! May 15, 2020 · Be sure to take off ALL the polymer at all the spots. Various Polymer 80 Glocks (L to R: FP940v2, FP940Vc1,FP940v2) There’s also an aggressive texture one only from Brownells. By measuring it looked like the rails were also thicker (than the real G43) and sat up too high when installed, which accounted for the hole alignment problem. After building over 200 P80 handguns, we have found some tips to guarantee first-time Polymer80, also known as P80 or Poly80, specializes in manufacturing the most popular 80 percent frames compatible with the most common Glock and other handgun manufacturer components. If the pictures are not presenting some kind of optical illusion, I can see where the rails being that low would be problematic. I’ve built multiple p80s and this is the first rear rail that’s been a pain in the ass. Built with high-strength reinforced polymer construction, the The kits include the Locking Block Rail System, Rear Rail Module, and 2 pins. It’s possible that I messed up milling the channel that the recoil spring rests in but I don’t think that would effect the rear rail issue. If you watch MGB’s (marine gun builder) second pin video (I think it’s called pin masters with yoda in thumbnail) he revealed that the bottom U portion hits a polymer shelf inside the frame too soon, resulting in rear rail sitting too high. There is a separate Rail The Polymer80 PF45 Full Size 80% Pistol Frame offers enhanced ergonomics and features. How to Level the rear rails 6. I really would recommend everyone that bought these return them. Polymer 80 Rear Rail Fixes Marine Gun Builder illustrates how to correct and troubleshoot your Polymer 80 Glock Build and the most common issues with the rear rail First Glock 19 build - two issues I ran into 1. Rook Tactical's enhanced rails are made specifically for Polymer Pistols, which improve the performance and functionality of your slide. The hole on the front is to slide a double a battery or even a small flashlight in there if you can find one that fits. ATTN: NEWCOMERS. Having a flat and curved backstrap is a pretty nice Polymer 80% lowers and frames are the best way to build a factory-spec handgun or polymer AR-15 at home. Frame, rail, trigger, battery, function, connector, FTF issues READ BEFORE POSTING ISSUE! 🔥QUALITY CONTENT!🔥 Share Add a Comment Sort by: Best Open comment sort options Best Top New Controversial Old Q&A justntn610 • Hate to crowd the thread but I figured I’d post an update on how I resolved my Polymer80 trigger issue. Dec 25, 2023 · Polymer 80 has the tried and true solid rear rails, but this actually comes with a handful of downsides. by u/MarineGunBuilder. I took it apart and found that the rear rail assembly was bent on one side. Building a Polymer 80 pistol frame can be a fun and rewarding experience, but it can also be a little frustrating if something goes wrong. Especially when you found an in-stock P80 in your favorite color you may not want to have to buy a new lower frame. Lots of work needs to be done for them to sit properly inside the frame and have the rear pin go thru them without any problems. Sep 3, 2025 · Basically, P80 told me to go screw myself when I asked for a fitted rear rail replacement. I have 2 - problems with the build though and need to ask my fellow memebers of the group. It took a few hours. #1) I cannot get the slide to "rack" all the way back,,, it May 30, 2018 · It's been more than a month since I contacted Polymer 80 with the same kind of problem and still no new frame. Offering compatibility with Glock® 43 Gen4 components, the PF9SS™ frame comes with an aggressive texture that emulates a stippled pattern, an extended beaver tail, double undercut trigger guard, and a thumb ledge. Why Split Rear Rails? Our patent pending two-piece rail design allows better alignment across the frame, rails, and trigger housing and provides for a smoother build experience when installing your Simply drop everything in and hammer in your pins. In 1 case I just heated them up and bent them back to straight. Then replaced P80 guide rail problems #how to fix. Oct 29, 2024 · Save your money and go with lowers that have stood the test of time. Additionally make sure where the trigger bar gets near the rear rail assembly there is enough clearance. The patented Locking Block Rail System (LBRS) and The Rear Rail Module (RRM) are now available in the PF-Series Rail Kits. Includes serialized pistol frame, locking block rail system and rear rail module, complete pistol frame parts kit Aug 21, 2023 · The rail guides or tab cutouts show Polymer 80 builders which part of the polymer frame to remove to install the rear rails and locking block. Would there be any downside to cutting it out like the rook tactical rails? I have a hacksaw and can smooth up Glock 19 HK MK23 Replica / P80 Rails cults3d This uses polymer 80 rails like most of my other files and uses the pf940c rails directly from there web sight. Reply reply DirtyDee78 • See full list on 3dgunbuilder. What’s Included P80 80% Pistol Frame w/ blank serialization plate Stainless steel locking block rail system (LBRS) Stainless steel rear rail module (RRM) Hardened pins for installing LBRS and RRM The SS80 Frame: Glock 43-Compatible The G43 is one of the most popular carry guns on the market today. Blue line should sit flush with frame Dec 24, 2021 · Shop our selection of custom Glock barrels, slides, polymer 80 pistol frames, firing pins, backplates, trigger housing, guide rods, magazine floor plates, slide locks, trigger housings, front locking blocks, and other upgrades for your Glock 17, 19, 34, 45 and other models. If you want to build a full-size Glock 17/22/33/34/35, get the PF940v2. Polymer80 Support Form Polymer80 Contact Us Page REAR RAIL MODULE (RRM) COMPATIBLE WITH POLYMER80 PF-SERIES FRAMES Will fit P80 Models: G26/G27 Sub-Compact G19/G23 Compact G17/G22 Standard Includes: (1) PF-Series Rear Rail Module (RRM) DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. Compatible with Polymer 80 PF940V2/PF940C/PF940V2 ROOK Tacticals Precision Machined Rear Rail System. 5mm (that's half the hole diameter). ? One pin for the pre-formed hole in the front of the frame and one pin for the hole you drill in the back of the grip. Polymer80 PF Series Rail Kit The patented Locking Block Rail System (LBRS) and The Rear Rail Module (RRM) are now available in the PF-Series Rail Kits. MANDATORY fix, b4 asking for any function/problem help/advice (& PLZ do NOT "level sand" the top of your rails, or bend/file/shave any other parts) Sep 2, 2017 · Additionally polymer 80 corrected many of the Glock flaws, such as the disconnection between the front rails and the barrel lock block, the skinny rails, the reinforced the plastic in key areas such as the front Picatinni rail area and they thickened the plastic over the Glock mechanism area, about the trigger and pins. Improve your Polymer80 with the SPLIT REAR RAIL FOR POLYMER80, designed for enhanced durability and performance, ideal for DIY builders seeking precision. 5D Tactical - Split REAR Rail Upgrade for Polymer80™ (P80™) $35. The tolerances for all guns regarding slide fitment are minuscule; you need to keep troubleshooting. Polymer 80 Slide Issues- How to fix a rough slide action 3. One Jan 30, 2019 · I think I found the problem. Sliding them in they look like seagulls from a Bob Ross painting. Concerning the rear rails, they too will not seat down far enough to be flush with the neighboring polymer. Expert Review. Feb 26, 2021 · Parts List Polymer80% Kit First…choose the size. Apparently they're made in Israel, so you have zero recourse against the manufacturer if your slide comes loose and turns you into the worst Halloween unicorn costume ever. Enhance your build with precision fit, durability, and improved performance. Rule of thumb is generally a thickness of a hallmark card. Jun 8, 2018 · So here it goes After my polymer 80 build was complete I took it to the range for the first time. Before I ordered rook rails I Sanded the FRONT, bottom and curve of rear rail depending on what direction silver moon what showing from in pin hole. 1. Apr 11, 2024 · We have also had to polish the rails using a dremel (with both Polymer 80 and Geislers). Machined from solid Billets of the same 17-4 material as our front locking blocks, these high quality precision rails are designed to work in Tandem with the ROOK Tactical Front Locking Blocks Feb 28, 2021 · Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. The geisler defence comes with 2 separate rear rails unlike the p80. All the videos I watch on P80 assembly stress that these need to be flush. In order to eliminate all variables, what happens if you leave out the Recoil Spring Assembly and barrel, does the rear still bind? Upgrade your Polymer80 with the Complete Rail Set for P80 PF940V2 G17. About every 4 or 5 rounds, the slide fails to go back into full battery which then causes a light strike on the next round. [PARTS] ROOK Tactical Rear Rail System Compatible with POLYMER 80 PF940 V2/C/SC - BACK IN STOCK ($38 + shipping) As industry leaders of the 80% market, we properly engineered and manufactured our rails with a connector clearance cutout so builders can avoid the “mush” caused by other rear rail systems, keeping your trigger feeling the same way without any unnecessary filing, grinding, or “tuning”. In the other case I had to sand or dremmel the rail. I've only taken it down all the way once since then, but it popped back in with no problem. Upgrade your project today! Mar 19, 2020 · Looking at the rear rail setup, my right rail was angled up from the rear to the front and the left was flat. The solid system is prone to bending, causing slight alignment issues that prevent the slide from functioning correctly. Many rear rails have this problem and it's a simple fix. Dec 12, 2022 · JB Weld for the Polymer 80 is pure magic. The 5D Split Rear Rail System offers the highest value and quality when looking to improve the fitment and performance of your double stack 9mm P80™ frame. . The Locking Block Rail System (LBRS) and the Split Rear Rail Module (SRRM) are now available in the PF-Series Rail Kits. So they had me destroy the frame and shipped me another. There is no better bang for your buck. From failures to fire to failures (FTF) to eject (FTE), there could be a lot of issues if you mess up simple details on your Polymer 80. you make have to Engineered for durability and reliability, this precision-stamped rear rail is built to meet OEM specs. I straightened it out and the trigger almost works now, but not quite right. IRON MAN DAN🇺🇸 480 subscribers Subscribe Aug 4, 2020 · Hello Just wondering why you didn't drill straight through and install a roll pin like the Polymer 80? Is it because of the slot on the ss80 front rail? Could it be done? As industry leaders in the 80% market, we’ve engineered our rails with a connector clearance cutout to eliminate the “mush” that often plagues other rear rail systems. the holes were out of alignment by about 1. Working on my first polymer 80 and the dreaded rear rail issue happened. The AFT (Assemble For Thyself) kit by Polymer 80 is designed with the home builder in mind. Actually being able to slide a credit card or two between frame and slide is a fail. I used an OEM Glock complete slide. Machined from high-quality stainless steel with incredibly tight machining tolerances, ROOK's Rear Rail Module provides perfect alignment and lock-up for your P80 slide. These include: the “Stencil” or Jig as most call it, Drill bits, front and rear rails, rail caps, 2 backstraps, a magazine well, and adhesive. This kit includes the Locking Block Rail System, Rear Rail Module, 2 different Pins, a Slide Stop Lever and a Slide Stop Spring. May 16, 2020 · I figured out what is wrong with my Polymer 80 PF45 10mm build. Personally I solved this problem by going to local sheet metal fabricator and making my own rear rails from 16 gauge 52100 bearing steel,telling the guy that it is U-bracket for rolling office chair 😁 The wait is over! You can now purchase our latest rails for your PF-Series pistol frame. As industry leaders of the 80% market, we properly engineered and manufacture our rails with a connector clearance cutout so builders can avoid the “mush” caused by other rear rail systems, keeping your trigger feeling the same way without any unnecessary filing, grinding, or “tuning”. Due to ATF Regulations we cannot carry or sell Jigs to complete 80% Blanks. These receiver and frame blanks are lightweight but tough, and 100% compatible with their weapon platform's retail parts. Front slid in perfect but the rear one was stubborn as hell. The slide lock spring did not lock in place (Fix: shave off a bit of the spring that enters the hole). Any suggestions what to sand, I’ve sanded it to the best of my ability’s and even tried some of my other rails from other builds and it’s the same thing. Now, if I can just get a new rail The rear rail/trigger housing pin was a similar story. Sep 30, 2024 · One of the most popular 80% pistols in 2023 is the new Geisler Defence G19X GEN 1-3 Compatible 80% Blank. Working my way through the steps there and it feels like a lot of work for a non functional piece (sanding the bottom of the connector. Currently Polymer 80 frames come with the rails and rail pins. How to fit the Polymer80 Rail sections 4. There is a separate Rail Kit for each frame so be sure to choose the correct Rail Kit for your frame. PF9SS™ Single Stack Frame Polymer80 is pleased to present the PF9SS™ 80% Subcompact Single Stack Frame. It's a lot narrower than on the smaller frame and it must have bent when I pounded the rear pin in. Polymer 80 Troubleshooting trigger issues – Trigger not resetting 2. At 3CR Tactical, our firearms experts have decades of experience with Polymer80 and 80% pistol builds. I contacted customer service and they referred me to MGBs rear rail video. Figured I’d share my way of fixing the rail issues while building a P80. Jan 11, 2024 · To ensure that your build project runs smoothly with minimal problems along the way, it’s important to know some common troubleshooting tips. Elevate your customization with precision-engineered components by using the Smith Defense Complete Rail Set – P80. It comes down to improperly located retaining pin holes. This took many hours of doing it little by little (especially with the rear rail). Below are several pictures showing the issue. xgky jgctq cmxyq cbe umcid mijuci glir wsguwyz cypk xqusd zgcf ayfz qwu lusm dogtt