Some company and I don't know who they were/are was putting out some 450 Bushmasters that refused to extract and eject. My local gun guy did everything he could to get the problem guns (plural) to work. His last effort to get them to function was to open up the gas port. That fixed the problem. They were simply under gassed.
However, he used the number drills and picked out a number slightly bigger than the existing hole. If that did not work he went the next number up. He didn't just pick out a drill bit he thought was OK and use it. A 1/8th drill bit is .125" diameter hole. I think his final number was in the .090 range. .125 is probably going to over gas the rifle. Find someone with the numbered bits and work up from the existing hole until the gun is reliable.
kwg
Last edited by kwg020; 05/09/20.
