polymer 80 glock build help

davsco · Jan 5, 2020

so my first poly80 glock, done a handful of ar15's & 10's. hard to tell with the pics, but the rear trigger block and the poly80 rear block seem to be tilting up just a bit in the front. the trigger bar seems to be higher than in my oem glock. as a result, i have to really press down on the ejector for the slide to come all the way back (ie the ejector is blocking the slide coming back because it is sitting a little high/angled up).

it is very hard to rack. i think in part from the ejector rubbing on the bottom of the slide and the rear rails not being parallel to the front rails. i don't see the slide rubbing on the frame. the lower parts are an oem glock kit.

i've just emailed p80, but if you see anything obvious or have any suggestions, i would appreciate that info. thx, david

StantonCree · Jan 5, 2020

Does it eject rounds? Does it not ride forward fully everytime when racked?

davsco · Jan 5, 2020

haven't actually fired it yet. if i retract the slide all the way and let it go, it will go all the way forward. but if i walk the slide forward it will stop before going all the way forward. def binding, seems to be on rear rails and/or the ejector angled up/sitting a little too high.

Magnumst · Jan 5, 2020

The few I have done have been stiff and need to be cycled several hundred times to for smooth action. I also run the slide guild rails on a diamond stone until all the coating is file off. It seems to cut down on the break in time.

Tungsten · Jan 5, 2020

This may be a dumb question but did you lube the rails? Even for just testing the fit, it can make a hell of a difference.

Speed3 · Jan 5, 2020

davsco said:
haven't actually fired it yet. if i retract the slide all the way and let it go, it will go all the way forward. but if i walk the slide forward it will stop before going all the way forward. def binding, seems to be on rear rails and/or the ejector angled up/sitting a little too high.

I had the same problem. Pull all the way back and slide goes home. Walk it home, or dont pull back all the way and it hangs up 1/2" from going home.

I cycled by hand maybe 100 times and although improved, wasn't 100%. Test fire went similar on the first mag, some went home others didnt. I had to bump the back of the slide maybe 1/3 of the rounds. After 100 rounds or so, ran fine. Even ran 158gr one handed(limp wrist) fine.

You might find it will break in after 100 rounds or so.

jjones88 · Jan 5, 2020

I recommend running it for a bit. My polymer80 G19 took about 100 rounds of fire, FTE / stovepipe, hand cycle.

It should break in nicely. Had my first FTE after maybe 2-3k rounds of wolf ammo after the break in.

Muleskinner · Jan 5, 2020

I've built a little over a dozen. Turn on your TV, find a good show and watch it while racking the slide over and over...all the way back and let it go forward...over and over...you will know when you're finished

budman93 · Jan 6, 2020

The ejector looks all right i think. Most likely the rails are super tight. Probably need some polishing and possibly a bit of sanding to get a good fit. And rack the heck out of it.

INMY01TA · Jan 6, 2020

I just finished one too. My striped slide would hang up a little around the rear rail when test racking as well. Once I finished the slide with the guide rod and spring it all felt normal to me.

StantonCree · Jan 6, 2020

If it’ll eject rounds and then go back into battery you should be fine just needs a break in as others mention

Decoy · Jan 6, 2020

Works every time.

also check this out at the 31 min mark

https://gunstreamer.com/watch/polymer-80-glock-build-rear-rail-fixes_QafEswqmu57SmOU.html

Speed3 · Jan 6, 2020

Decoy said:
Works every time.

I like that idea!

GuitarmanNick · Jan 6, 2020

Stoning the rails is easy to do and makes a world of difference. Be sure to lube the guide rod, recoil spring, and rails to insure smooth operation. Be sure to select a lube that is safe for use on polymers.

davsco · Jan 6, 2020

the secondary issue is that there is some rubbing/binding going on. the larger issue is the ejector has been blocking the slide coming all the way back during assembly, i've had to really press on it so that it fit under the slide.

randomuser · Jan 6, 2020

Get a really fine grit sandpaper. Think polish, not sand.
turn gun over and circular motion, hit all rails at one. don't take off any metal. Just smooth things out.
Then
Get some of that metal polish (I forget the brand) and polish the rails.
It will be smooth as butter.

There is a guy named Johnnyglock on youtube where you can learn how to polish them up (what polish to order).

MindTheGAP · Jan 6, 2020

randomuser said:
Get a really fine grit sandpaper. Think polish, not sand.
turn gun over and circular motion, hit all rails at one. don't take off any metal. Just smooth things out.
Then
Get some of that metal polish (I forget the brand) and polish the rails.
It will be smooth as butter.

There is a guy named Johnnyglock on youtube where you can learn how to polish them up (what polish to order).

This^^

On over half of my P80 builds I've had to smooth the top of the rails down in this fashion. Otherwise, a) it grinds the SHIT outta the channel on the slide for the rails, and b) you will have it sitting with a fat gap between frame and slide.

I also, as an experiment on one, stuck some of the polish directly in the slide rails and then racked the pistol a couple hundred times and it is one of the smoothest ones I have now.

Decoy · Jan 6, 2020

davsco said:
the secondary issue is that there is some rubbing/binding going on. the larger issue is the ejector has been blocking the slide coming all the way back during assembly, i've had to really press on it so that it fit under the slide.

I think once the rails are straight that issue will be resolved as well.

outrider58 · Jan 6, 2020

Decoy said:
Works every time.

also check this out at the 31 min mark

https://gunstreamer.com/watch/polymer-80-glock-build-rear-rail-fixes_QafEswqmu57SmOU.html

None of that works until you drill and pin those two slide rails into the frame. Only then should you work on 'timing' the rail sets together.

Decoy · Jan 6, 2020

outrider58 said:
None of that works until you drill and pin those two slide rails into the frame. Only then should you work on 'timing' the rail sets together.

Agreed, I didn't realize he didn't pin them in place in the video.

polymer 80 glock build help

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