Made an aluminum breech

My breech O-rings were worn so instead of just replacing them I decided to make a new breech lol. I machined this one out of 6061 instead of the factory delrin and made the tolerances tighter so it doesn’t flop around. I also grooved it for 3/32″ o-rings instead of the original 1/16″. I cut the grooves to the tolerances listed in the machinery’s handbook but I think I need to go back and loosen them up a bit as the cocking effort is a little bit too high right now but it won’t be a problem to fix. Looks cooler and no more wasted air out the breech.

I had a member ask me if I could make him a breech out of bronze, has anyone tried that? I’m thinking the breech will be so heavy it will absorb a lot of the hammers impact rather than transfer it to the t-hat. This aluminum one “feels” about the same as the delrin but I don’t have a gram scale.