...and the military also uses shitty fragile aluminum GI mags with tilt-o-matic followers.
What does that tell you?
We can pay for gizmos, but we forget the basics.
We have Velcro on our uniforms. Don't laugh too hard.
...
Slims: Totally cross-threaded here. That's awesome.
Bolt? Honestly, I'm not sure. Judging from the disassembly pictures, I'd have to guess open bolt... it uses that fat proprietary AR15 many-lug but the mash-up looks way similar to the M249. I could be wrong and they could have doo-doo'd themselves with a closed bolt. Open bolt would be the only thing that makes sense on a full auto belt fed AR.
It sure is gnarly, though.