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2/24/2015 8:00:35 PM EDT
The setup:







Caliber: 300 BLK


Upper: Anchor Harvey



Lower: Palmetto State Armory



Magazine: PMAG Gen M3 (10 round)



Bolt group: PTAC










Whenever I try to feed a magazine in on a closed bolt, the top two rounds get vertically criss-crossed.  Has anyone else had this?  I'm hoping I can just blame the PTAC BCG and get a new carrier.




 



EDIT: https://www.youtube.com/watch?v=yMBOFnH6rEE
2/24/2015 8:58:58 PM EDT
[#1]
The only help I can offer is to embed the video for you.

2/24/2015 9:02:54 PM EDT
[#2]
Does it feed or does it have issues? If it feeds I wouldn't worry about it. I really don't see how the carrier can be to blame here.
2/24/2015 10:14:33 PM EDT
[#3]
Well I got sick and tired of living in fear over this, so I finally just tore the insides out of my lower, reassembled the two receivers together, and chambered a bunch of rounds.



Good news:  Absolutely ZERO failures to feed.




Bad news:  The top two cartridges seem to have lost their crimp.  They wiggle and smell like gunpowder.
2/25/2015 1:00:14 PM EDT
[#4]
That happens sometimes when inserting a mag on a closed bolt. I bet it feeds just fine and I wouldn't worry about it.
2/25/2015 3:28:22 PM EDT
[#5]
Quote History
Quoted:
The only help I can offer is to embed the video for you.

http://youtu.be/yMBOFnH6rEE
View Quote


In order for the cartridges to be jammed side x side like that, the top of the magazine has to spread. This is very destructive for the magazine and is not conducive to your survival in a gunfight if this happens when you do a 'tactical reload'.
You most likely will have to down-load the mags by at least two rounds and/or cease loading against the closed carrier. I would simply not figure on doing the 'tactical reload', which is the only time it is required to lock in a loaded magazine against the closed carrier. At all other times of loading, you can lock in a mag with the bolt locked open.
2/25/2015 8:02:14 PM EDT
[#6]
Maybe the mag is flexing a little allowing the rounds to do that.  Have you tried other mags?
2/25/2015 10:24:45 PM EDT
[#7]
Mag body is over swelling/middle budging, and causing the round to sister side by side in the mag; instead one on top of the next staggered.

Run a standard USGI aluminum mag and see if you are still having the problem.
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