Someone I know who makes there own cans says he puts a brake like thing in the can to make the can twist onto the threads with each shot to stop the can coming lose.
I have a qd blast deflector that I can fit over the brake on my 3gun rifle and it decreases the effectiveness of the brake notacably but it's still more effective than no brake.
Not answering anyone's questions sorry but thought these two points were relavent to the thread
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