JP GMR-15 PCC Feed Issue

[Volfan45]

Starting to experience rounds not feeding from magazine to chamber from time to time. Before I start replacing magazine springs, I was curious if it could be some other issue. Usually starts after 75-100 into the match.

 

Anyone else have this issue ? Magazine related?

[TRUBL]

Seems like maybe a dirty chamber issue??? Does it go into chamber....but not completely? Or is it not even getting to the chamber?

An occasional bore snake can take care of one issue.....the other, well....who knows

[Volfan45]

Not getting to the chamber…will try the cleaning mid-match. 

[Fasthenk65]

It should be easy to shoot 500 rounds without a problem.... did you change OAL accidentally 

[Volfan45]

Shooting standard 115 grain 9mm…no changes lately.

[philmadxx]

What mags are you using?  Extended? Some of the cheaper Glock copies have inferior springs in them, I avoid using them for the most part but I have a couple I've changed springs in (Wolff) that run perfectly.  Try to eliminate which mags are causing the problem - number and track them.  

Mid match cleaning should not be required, mine has over 1000 since last clean (embarrassing but true)

[Darqusoull13]

My favorite story of my GMR was running 4 shooters through a 250 round falling steel match suppressed. It doesn't really matter how dirty the GMR gets, if you keep adding oil it will run.

If your bullets are not making it into the chamber, check your magazines for dirt then check the followers for wear then replace the springs if you haven't in a year. 

If you are not using GLOCK-Brand-GLOCK mags, replace whatever other mags you are using immediately. 

The GMR platform is stupid reliable. Always, always, always check your magazines when you clean your gun. If a mag hits the ground, unload and clean it before running it again. 

[Tampa-XD45]

On 6/5/2022 at 8:41 PM, Volfan45 said:

Shooting standard 115 grain 9mm…no changes lately.

Does the problem occur with different mags?  Is the round hitting the top of the barrel?

[gunshrink]

The one that I have will only work with factory Glock - not a problem other than a couple times on extraction but otherwise fine. I put in something else and it will fail in three or so. So, eat the cost, pay for the quality and have your gun work in matches

 

[Old3GNR]

I've been running a JP GMR-13 for years.  The GMR-15 is built the same way using a blow-back system This is extremely dirty.  I clean my bolt group and chamber at least every 500 rounds.  

[Scrounger]

Another thing to check is if the feed lips are bent.  It can happen when jamming them 100’s of times against a closed bolt.