The pinned barrels do not have a hole they have a small slot and anyone who has a decent small file could have the slot filed in less than a minute. The slot isn't that precise either. You can turn a pinned barrel about 5 or more degrees in either direction if the barrel shoulder doesn't torque up right to the frame. The pin actually does about nothing. If a barrel came untorgued it would stop it from turning more than 5 degrees and thats about it. They do look nice though.