I wondered for a while if it would work also. After reading this post and mikes 9mm breech post it lit a fire under my a**. So instead of finishing one of my other builds I machined this breech out of 3/4 stock delrin I had. Thought it came out well. The weaver rail added a lot of strenght to it. It will deffently need a barrel band and maybe even two. Will probably test it out next week.