Quoted:
Awesome. Does it run? No one has gotten a 300 BLK piston gun to work in the AR platform it seems.
Nope, doesn't work worth a damn. :)
I'm pulling it off and doing DI, I'll put the piston on my 7.5" .223.
It MIGHT work if you drilled the barrel and the gas block out something fierce, but I'm just not willing to potentially ruin an expensive system for the purposes of testing.
I removed all the weight from the buffer, then I cut coils on the spring. As I suspected it never even got to the point where it was ejecting before it failed to chamber. The amount of pressure .300BLK generates is just pathetic. Even when I was loading very hot charges I couldn't get it to work. Like I said earlier, it MIGHT work if you bore out the gas port and the piston block, but I quit there.