Define USGI. Who made it and where did you get it?
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Define USGI. Who made it and where did you get it?
the Bushmaster mag in my new rifle did the same thing out of the box. I switched to PMags and haven't had a FTF yet, then again im NOT an armed professional...
Assuming that everything was assembled properly and you weren't using garbage ammo I would say that the spring in the 20 rounder is worn. Simply try a new one of known quality and see what happens.
I got the BCG at a gun show from a guy selling a variety of Ar-15/M-16 parts. He had used and "as new" U.S Government Issue M-16 BCG's. I bought an "as new" one. The bolt is marked MP and the carrier has no markings. Both looked new. The ammo is reloaded (reclaimed) SS109 on LC brass, also bought at a gun show. I would be much more inclined to suspect the ammo than the BCG.
You might have dropped the mag on a hard surface feed lips down.
That peens a little case rim indent that will cause the round to either bind or top tip down as it overcomes that little lip.
So most likely it's magazine related. Take a look at the magazine's feed lips. Carefully compare to a new mag.
It could be weak spring pressure too or worst case and most unlikely short stroking from a misaligned gas block or worn or aligned gas rings.
Somewhere in between; it's from a guy who is at the local gun shows who reloads a variety of calibers. Definately not factory, but the guy loads a lot of ammo.
When I go the the range, I don't just use one mag. Rather, take several and load them up all at once so when I start shooting I can keep at it. The range I go to only allows a max of six rounds per mag (what this is supposed to accomplish, I couldn't offer a guess). Anyway, I had only three mags that day and I didn't use one of them at all (a dedicated five rounder). So it's narrowed down to two 20 round mags. They're both Simmonds Precision Products, Inc. with metal followers.
I'm going tomorrow to practice some position shooting, so I'll have a chance to try a new mag and see if I still get the failure or not.
I number my mags and keep a pen and post cards in my range bag. If I have a malfunction I right down what mag I was using , what type of malfunction and what type of ammo I was using at the time. It helps to trouble shoot the more accurate the info you have.
Use factory ammo for sure I like to if I can to use 5.56 pressure ammo for trouble shooting problems.