polymer 80 woes...

[badicedog]

Hi guys, I have a polymer 80 mated to a factory Glock 19 upper. I took it out for a function/reliability check. I had a partial ejection on every 3-4 rounds. I tried several different magazines, factory Glock, Magpul with same issue. I changed uppers for another factory Glock 19 and problem resolved. I'm trying to troubleshoot the problem with the upper. Factory Glock upper are original and have not been modified what so ever. Any help of clues would be much appreciated.

[heyjerr]

From what little I know, there are some different versions out there so I am only offering a few suggestions:

- Try putting the slide on without the recoil spring or barrel to make sure it slides smoothly. I believe there is a chance that alignment could be off or some contact points are still present.
- Make sure the channel for the recoil spring does not contact the spring. That interference could affect cycling.
- Basically any contact points could be in need of polishing. I've even read about minor misalignments of certain parts, like the ejector on the trigger mechanism or an out of spec rear plate, that can contact other parts and slow down cycling enough to cause issues.
- Also, check the extractor on the problematic upper to see if it is chipped.

I'm sure others may have better ideas but this is somewhere to start.

[Oldmandan]

Hi guys, I have a polymer 80 mated to a factory Glock 19 upper. I took it out for a function/reliability check. I had a partial ejection on every 3-4 rounds. I tried several different magazines, factory Glock, Magpul with same issue. I changed uppers for another factory Glock 19 and problem resolved. I'm trying to troubleshoot the problem with the upper. Factory Glock upper are original and have not been modified what so ever. Any help of clues would be much appreciated.

[Eatmyshade]

I think they are if you apply for a serial number before building it.

[edgerly779]

^^^ Then it is a single shot forever,

[SkyHawk]

I think they are if you apply for a serial number before building it.

Not semi auto they aren't

Anyhow presuming the OP is doing this out of state, make sure the extractor is not damaged, is installed correctly, and the extractor bearing, depressor and spring are not damaged. Make sure the extractor notch in the slide is clean, the extractor is lightly lubed etc.

And try a different recoil spring assembly - try the one from the working upper.

[Oldmandan]

I think they are if you apply for a serial number before building it.

[ar15barrels]

Hi guys, I have a polymer 80 mated to a factory Glock 19 upper. I took it out for a function/reliability check. I had a partial ejection on every 3-4 rounds. I tried several different magazines, factory Glock, Magpul with same issue. I changed uppers for another factory Glock 19 and problem resolved. I'm trying to troubleshoot the problem with the upper. Factory Glock upper are original and have not been modified what so ever. Any help of clues would be much appreciated.

Swap ONE part at a time from the problem top half until you generate the problem in the factory glock upper.
Swap in the barrel and test. Does the problem follow the barrel?
If yes, then the barrel is suspect. If no, then put the original barrel back in and try the extractor or some other part.
When you get to the slide, strip ALL the original glock parts off the good glock slide and install them on the suspect slide so that you are testing ONLY the slide.
Continue swapping in just one component at a time until the problem arrives on the original glock upper and that will be the bad component.

[ar15barrels]

I think they are if you apply for a serial number before building it.

FMBUS handguns have to be single shots unless they are registered AW's.

[ar15barrels]

Anyhow presuming the OP is doing this out of state,

I'm pretty sure I know who the OP is and he moved to Arizona a couple years ago and just has not updated his location on his calguns profile.

[spyde12]

Take a picture of the channel. It should be flush with the front rail block. Remove any excess material. I'm guessing the spring and rod is rubbing and messing with the cycle. This is a common occurrence.

Sent from my HD1925 using Tapatalk

[xsefan]

Clean all holes in the slide with a drill bit, by hand. Look for burs make sure you have rod spring and rubber backing for the extractor.

[vpravada]

Does the upper work on a glock frame?

[Gun1]

^^^ Then it is a single shot forever,

Not forever, just until it's DROSed.

[ar15barrels]

Not forever, just until it's DROSed.

It's illegal to transfer (DROS) self-built firearms in California.