Bolt guns lock the lugs against the steel receiver, the barrel is threaded into the receiver.
AR's lock the bolt into the barrel extension that is threaded into the barrel.
Have you ever seen how much play the bolt carrier has in an upper receiver?
How about the play the bolt has in the carrier?
If anyone wants to square up an upper, be my guest. I would simply like to know if anyone has took a gun that wouldn't shoot and squared the upper and it started shooting bug holes. Anyone?
