We have a 4th of July machinegun shoot at my local range. Running a subgun bay and decided to bring out mostly 9mm stuff as it was over 100 out and we were not expecting a big turn out. All transferable, at least in a free state(Va sadly).
With Virginia going to crap with its gun laws I grabbed another APC223 back in March to have a spare. Managed to get a stock pin out of B&T USA right as they blew up and one of the longer rails from AX. I did swap the B&T surefire mount for a real surefire one as I tested it with a SB2 when I picked it up and it locked up tight but almost no twist of the lock. The surefire mount gives more on both the surefire and those B&T printed cans that use a surefire mount(got 2 of them when they were 600 bucks with mount last year).