Beretta PMX GAS Submachine Gun

[novioman]

Having trouble with the mag on my Beretta PMX, started not feeding up bb’s after a few shots, have to remove mag, and then pull follower down a little and release, then next bb pops up, fire a couple more then the mag doesn’t feed up again. Any suggestions.

[Nick G]

Sounds like the follower is sticking. Try stripping the mag down and inspect the follower of damage or burrs and check the channel in the mag. 

[novioman]

Simple cure, make sure you stack the bb’s with the lower one on the right, works perfectly then.

[SerialNoodle]

On 05/03/2024 at 20:23, novioman said:

Having trouble with the mag on my Beretta PMX, started not feeding up bb’s after a few shots, have to remove mag, and then pull follower down a little and release, then next bb pops up, fire a couple more then the mag doesn’t feed up again. Any suggestions.

Either the BB's are just getting stuck, in which case I'd stack them as carefully as possible or consider trying a different brand of BB's. Some have different tolerances to others and some like to stick just a little bit- or there's some dirt/damage on the follower/follower track, so maybe taking a look and cleaning it would help. 

Alternatively, it could be this. 
The PMX/MP9 magazines have a strange follower design, in which you pull down the follower and it will lock itself for you, you should see a small tab at the bottom of the follower pop out. Once the magazine is filled, you have to push in that button again to release the follower otherwise it'll feed one or two BB's then stop, as the BB's aren't being pushed up. It's caught me out so many times on my MP9 and its a fair simple, yet easy-to-forget thing to do. 

Edited May 17, 2024 by SerialNoodle

[novioman]

8 hours ago, SerialNoodle said:

Either the BB's are just getting stuck, in which case I'd stack them as carefully as possible or consider trying a different brand of BB's. Some have different tolerances to others and some like to stick just a little bit- or there's some dirt/damage on the follower/follower track, so maybe taking a look and cleaning it would help. 

Alternatively, it could be this. 
The PMX/MP9 magazines have a strange follower design, in which you pull down the follower and it will lock itself for you, you should see a small tab at the bottom of the follower pop out. Once the magazine is filled, you have to push in that button again to release the follower otherwise it'll feed one or two BB's then stop, as the BB's aren't being pushed up. It's caught me out so many times on my MP9 and its a fair simple, yet easy-to-forget thing to do. 

Thanks, didn’t know about the tab. As I said on the post above the problem is completely cured by loading bb’s with the lower one on the right hand side, seems strangely fussy, but it works every time that way.