Most of Compensators, Flash Suppressors, breaks, are threaded on, using a crush washer. Although depending on manufacturer I have heard of some that are permanently attached.
Randal this crazy bunch threads the break on and then silver solders a hard pin in place. Ive cut a dozen or so off and its a trick not damageing the barrel and save the break. Its a guesing game on which side they put the pin on. I am going to set up a mag flux to see where the pin goes in the future. And I also have to reweld break to use it again.MSH
I just removed the brake from my AWB era carbine. It was a bit of a job. I thought that the pin was short & fat and went strait in but in fact, it's smaller diameter and goes in tangential to the barrel. I plunged into the center of the weld / silver braze spot with a 1/4" end mill and got into the threads on the barrel before I discovered how the pin actually was drilled. The pin must have been hard as it screwed up the end mill. I then TIG welded the hole in the brake and ran a bottoming tap in to clean up the threads to re-install. A lot of work just to install a free float tube.
On my dutch A.R.10 the muzzle is fitted to an outerbarrel,with fittings for firing granades, that is screwed on the actual barrel and then it's secured with a pin that is pushed in from the left side of the barrel.There is no welding on that pin.
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