Tag Archives: NAG

Polymer80 Glock Build Troubleshooting

If you haven’t heard about Polymer80, they make a number of 80% receivers including some remarkable Glock compatible frames. Now they aren’t just a cheap gimmick – I like the grip angle, the texture and the finger relief that all result in a far better feeling pistol than an actual Glock in my opinion. Now there are haters that say these are not Glocks – that’s fine, they aren’t. Then again, it’s not like we all buy ARs only made by Colt or Armalite either in comparison.

So I have been posting about how to do the builds [Click here for a Glock 17 using the PF940V2 frame post and here for one on Glock 19 using the PF940C frame post]. They are very straight forward, fun and can generate a reliable pistol. Like all things, there can be challenges and troubleshooting your build to understand why the slide is binding, the trigger isn’t resetting and so forth are all things that may happen. Luckily, there are also lots of videos and posts for understanding how to solve the challenges.

Be Sure to Read the Instructions First

I do recommend you read the instructions from Polymer80 before you do your build. If you didn’t read them and are now having challenges, I would recommend you go back and read the good instruction file they wrote and watch the video:

Troubleshooting Videos



Also, Pew Pew Tactical did a nice series of posts on building and troubleshooting Polymer80 builds. Click here to open a new tab and go there.

My Take On Common Issues

  • The slide doesn’t go all the way back: Check that the recoil spring is not catching on the channel you needed to mill out. Check that the slide stop spring is sitting flush and not catching on the spring. Sometimes plastic falls into that channel and keeps it from fully seating. (It would be a good idea to blow your frame out with compressed air to get all the loose plastic out).
  • Trigger not resetting – this is either an issue with how Polymer80 did some of the Rear Rail Modules (RRMs) or how the frame was drilled causing the RRM to move. If this happens, you will need to file a bit off the right side (when looking down at the receiver) of the RRM so the trigger bar doesn’t hit it. I’d also recommend checking that there aren’t burs/machining imperfections on any of the trigger’s metal parts that might cause binding.
  • Slide not cycling smoothly – The rail modules should be equal height. Again, there may have been an issue with drilling causing an alignment issue. See if you can bend/adjust the rail modules so they line up.
  • Trigger feels gritty – remove the trigger and polish all metal surfaces. Blow out the pistol and trigger areas to ensure there isn’t any plastic debris. Expect it to take a couple hundred rounds to smooth out.
  • Action feels gritting – again, polish everything. I like the small rubberized polishing bits for the Dremel as well as working with sandpaper up to 2000 grit. Always remember that your goal is to smooth and polish, not to remove a ton of material.

So, I hope this helps you out. Polymer80 Glock frames are well engineered and do work. There may be some issues you need to work through due to how you build the pistol and the parts you use but view overcoming them as part of your journey and don’t give up. The end result is definitely work it.


If you find this post useful, please either buy something using one of the links to eBay and Amazon. With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated. Doing something like the above will help us fund continued development of the blog.


Please note that any images shown were extracted from the videos and remain the property of their respective owner(s).


Steel City Arsenal [UltraLight] slide for Glock 26 gen 3/4 or Polymer 80 PF940SC

$279.99
End Date: Friday Mar-22-2019 15:42:03 PDT
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Polymer80 PF940CL-Black Glock 17 Compact Long Slide Frame

$169.00
End Date: Thursday Apr-18-2019 20:43:38 PDT
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Polymer80 17 22 Gen3 Compatible Frame Kit Polymer FDE

$169.00
End Date: Thursday Apr-18-2019 20:41:51 PDT
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Extended Magwell for Polymer 80 Glock Frame

$20.00
End Date: Tuesday Apr-2-2019 14:44:52 PDT
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Steel City Arsenal Slim magwell Specifically for Polymer 80 PF940V2 Frames Black

$74.99
End Date: Thursday Apr-18-2019 11:20:49 PDT
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9mm Economy Upper Parts Kit with Guide Rod fits Glock 17 Polymer80 PF940V2

$79.95
End Date: Monday Apr-1-2019 20:36:01 PDT
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Steel City Arsenal Slim magwell for Polymer 80 PF940C Frames- Anodized Clear

$74.99
End Date: Thursday Mar-28-2019 18:20:23 PDT
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Steel City Arsenal [RSNL] slide for Glock 26 gen 3/4 or Polymer 80 PF940SC

$279.99
End Date: Friday Mar-22-2019 15:42:06 PDT
Buy It Now for only: $279.99
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Steel City Arsenal Slim Magwell for Polymer 80 PF940C Compact Frames Battleworn

$79.99
End Date: Saturday Apr-13-2019 14:54:25 PDT
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9mm Subcompact Premium Lower Parts Kit fits Glock 26 Polymer80 PF940SC Gen 3

$64.95
End Date: Monday Apr-8-2019 18:05:09 PDT
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Great video on Doing a Polymer 80 Pf940V2 Glock Build

In the previous post, I told you about my finding Gunstreamer for firearms videos. What brought me there was that I was searching on Google for Polymer80 build videos.

On Gunstreamer I found this great video of a guy, who is obviously experienced in building Glock pistols, showing a build on a Polymer 80 Pf940V2 80% frame. He steps you through what needs to be done in terms of sanding, filing and drilling with the supplied jig and then he goes on to actually assembling the pistol.

I learned a lot watching the video – he has a solid informative style and shows you what he is doing.

Here’s the Video


If you find this post useful, please either buy something using one of the links to eBay and Amazon. With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated. Doing something like the above will help us fund continued development of the blog.


Please note that all images were extracted from the video and remain the property of their respective owner(s).


GLOCK OEM Extended Slide Stop Release 3 Pin 17 19 22 23 26 27 31 32 34 - SP07496

$13.45
End Date: Monday Apr-8-2019 19:33:19 PDT
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GLOCK OEM Factory Guide Rod Recoil Spring Assembly Gen 3 Glock 19 23 32 SP02457

$10.85
End Date: Tuesday Apr-2-2019 20:54:59 PDT
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Glock Extended Magazine Release Mag Catch Gen 1, 2, 3 9mm / 40 / 357 SP01981 OEM

$8.70
End Date: Tuesday Mar-26-2019 12:49:17 PDT
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Glock OEM Smooth Drop-in Trigger w/ Bar Assembly Gen 1 2 3 4 9mm,40,357 SP00357

$16.15
End Date: Monday Apr-8-2019 17:56:51 PDT
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Glock OEM Trigger Housing with Ejector SP00322 for Gen 1-3 9mm Glock 26 19 17 34

$10.85
End Date: Monday Apr-15-2019 18:13:45 PDT
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