It's not hard to do. I highly encourage it, though, if your shorty is a PCC that might not make the best first build since blowback pistol length AR-style PCCs are not easy to tune to be reliable.
It's not hard to do. I highly encourage it, though, if your shorty is a PCC that might not make the best first build since blowback pistol length AR-style PCCs are not easy to tune to be reliable.