[Gunnar]

I am interested to see if anyone else has this problem.
When I insert a full PMAG (Has to be full) into the ACR with an open bolt at about 50% to 75% power it pops the first round loose into the receiver and some times pops the round out of the receiver completely. It does not do it if the mag is not fully loaded or you insert the mag slowly. I believe the problem stems from the mag passing the magazine catch and hitting the bottom of the bolt catch from what I have noticed and there doesn't appear to be a fix for it (besides not putting too much force in your reloads). Just an FYI to stop possible double feeds on a tac reload.

 

[bomjoon]

never really loaded my pmag all the way. i guess i will try it and find out if mine does it too...

 

[JohnnyK]

I have not noticed this problem and tried to "make it happen" with my ACR, but no go. Have another "mentionable" though: Arrived at the range the other day, and after taking'er out of the case I naturally retracted the bolt/carrier and set the rifle on the bench. After iserting a full mag and setteling down I tripped the bolt release, got a sight picture...and "click". The chamber was empty. After a diagnosis I fugure what I did (or didn't do) was I did not retract the carrier far enough to engage the bolt itself. It's possible for the bolt catch to just engage the carrier and not the bolt itself. When this happens the bolt is extended in to the mag well and when a mag is inserted the bottom of the bolt is resting on the first round in the mag. Naturally when I had tripped the bolt release the bolt went forward and didn't pick up a round. In duplicating what I did sometimes the bolt closed and sometimes it dragged enough on the first round it only closed half way. Just an observation.

 

[matt2636]

how old is the pmag? and do you always keep it loaded? sounds like the lips are getting weak on it. if you left it loaded without that cap thing it comes with it could weaken those lips. try a different mag. either that or you are slamming it in there way to hard. with a open bolt (or slid with a pistol) you dont have to slam the mag in. mags go in way easier with the bolt open. actually with almost no force at all especially with those pmags. my glock with a fully loaded mag i can tip the pistol upside down and just drop the mag in the mag well and it clicks right in (with the slid open of course) but slid closed it wont click in. same with the pmags.

 

[Gunnar]

how old is the pmag? and do you always keep it loaded? sounds like the lips are getting weak on it. if you left it loaded without that cap thing it comes with it could weaken those lips. try a different mag. either that or you are slamming it in there way to hard. with a open bolt (or slid with a pistol) you dont have to slam the mag in. mags go in way easier with the bolt open. actually with almost no force at all especially with those pmags. my glock with a fully loaded mag i can tip the pistol upside down and just drop the mag in the mag well and it clicks right in (with the slid open of course) but slid closed it wont click in. same with the pmags.

The PMag came with the ACR and is in good working order. I first discovered it when my buddy was trying it out and he did a speed reload and I saw something pop out of the chamber, after he was done firing I found the round that popped out of the mag. After I got home I tried to replicate it and it took a few times to put enough force into it till I was able to get the round to eject from the mag. Like I said before you have to do it pretty hard (50 to 75% power) to get the round to unseat the mag. It was just something I wanted to bring up for people to keep in the back of their mind. When your adrenaline gets pumping i.e. competitions or real life scenarios people tend to go into gross motor skills with their movements and put a little too much power in their reloads, the last thing that you would want is a double feed in those situations.

 

[kjsl105]

I have had smiliar experience. Take a look at this thread:

http://acrforum.com/forum/showthread.php/190-Magazine-Overrides-Mag-Catch