AR Mag not Locking

outrider58 · Sep 16, 2020

It could also be an out of spec or improperly adjusted mag release.

randomuser · Sep 16, 2020

Here is a good video explaining it
https://www.youtube.com/watch?v=yPdIXXjM9z8

I have never put 30 rounds in my mags..the video is a good demonstration on why not.

vetogunban · Sep 16, 2020

Interesting twist, I think. Trying a few things and I noticed that if the top round is on the left of the mag, it will not lock in. If the top round is on the right is locks in fine. So I guess if I keep an even number of rounds I should have no problems. Though like others have said, there is a spec issue.

outrider58 · Sep 16, 2020

vetogunban said:
Interesting twist, I think. Trying a few things and I noticed that if the top round is on the left of the mag, it will not lock in. If the top round is on the right is locks in fine. So I guess if I keep an even number of rounds I should have no problems. Though like others have said, there is a spec issue.

Check you mag release button (on the starboard side). The screw should be less than flush with the button's surface. Any higher and it can cause mischief.

jjones88 · Sep 17, 2020

Occam said:
Had this happen to me at a match the other day. Forgot the "30-round P-mags should only be loaded to 28" rule, and while a bit of friction prevented the mag from dropping right out, it was NOT seated well enough for a feed. This had a non-trivial impact on my time for that stage! But nothing cements that lesson like having yourself reminded of it (again!) on the match clock. For non-windowed mags, just load them 'til they're full, then strip two out. All better.

Definitely not the first and you won't be the last. When I'm holding the timer and I see a PMAG go up during an administrative reload, I always think, "hope they downloaded it or they smack the daylights outta it".

A few matches ago, the good doctor had her mag catch fail but she had the full PMAG bite her twice in earlier stages.

jrumann59 · Sep 17, 2020

only have had this issue with he bolt closed on the AR.

vetogunban · Sep 17, 2020

outrider58 said:
Check you mag release button (on the starboard side). The screw should be less than flush with the button's surface. Any higher and it can cause mischief.

Picture of my mag release. Does that look close enough or maybe another turn?

vetogunban · Sep 17, 2020

Did find out if you give a very very firm smack it will lock.

vetogunban · Sep 17, 2020

Bountied said:
I've had this issue with certain mag/lower/upper combos with a full mag. A firm smack would seat it and with an open bolt it would go in easily and lock. Why not just load the mag on an open bolt and call it a day?

Doctor_M said:
You can't slap a female reporter on the backside anymore... but it is still acceptable to smack a magazine bottom with authority.

John from MD said:
It is an easy fix but the finish would be filed down past the anodizing. It makes it too expensive to do. I would be better to sell it off.

When I held it up to the light, noticed that the area by the pivot pin was hitting but the area by the take down pin was up a 1/16 or so. Filed down the area by the pivot pin and the take down pin fits in but still too tight. Will do a little more filling to get it closer.

Thanks.

outrider58 · Sep 17, 2020

vetogunban said:
Picture of my mag release. Does that look close enough or maybe another turn?

View attachment 294416

Hard to tell from that angle but try loosening one rotation. It's an easy thing to try before breaking out the file.

vetogunban · Sep 17, 2020

outrider58 said:
Hard to tell from that angle but try loosening one rotation. It's an easy thing to try before breaking out the file.

Thanks, I will adjust the mag release. I broke out the file to address the problem that the take down pin was not aligning properly. Still tight but much closer than it was before.

Thanks for the good advice.

AR Mag not Locking

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