POF P-415 gas piston system M4 upper SOLD
.223/5.56 16" fluted barrel, 1:8 twist, Miculek compensator
C.R.O.S. upper silicon nickel plated
This has around 500 rds through it, I used it as a back up 3gun upper. I bought it new in 06 when the piston craze was in full swing, I just didn't get...