Originally Posted by
NongShim
So as to not derail this thread, let's look at what is going on. It doesn't sound like an issue with the workings of the gun, since other than the 8th round, it supposedly cycles just fine. If the issues were occurring all the time, I'd be more inclined to think it was an issue with the gun itself. I'm a visual person, so it would be easier with a picture, but I'm wondering if there is an issue with the tension of spring getting weaker as the mag empties and not pushing the round up fast enough as the tension decreases. I'm guessing these are modified mags for a Kommie state? I'd suggest calling the company that modified them.
I have seen a DD gun that malf'd a good bit. I don't recall what it was doing, but I recall the mag variable being eliminated. Also, the malfunctions were sporadic, not consistent like your every-8th-round issue. Being a new factory rifle, I think the owner was going to just send it back to DD.
I get what you're saying about the mag working in your friend's gun. When I had PMags, most of them would work great in one of my guns, and work like shit in other guns. The idea of having certain mags that will only work with certain guns of mine was not satisfactory, so I moved on to other mags. If you try some other mags, you can eliminate your PMags as the issue. To clarify, you said, "bodies" implying more than one, but you spoke of your friend shooting a singular mag. Is this your one an only mag? Did you shoot any of your friend's mags? The magazine is the easiest variable to eliminate.