So last week I was out shooting my buddies 9mm AR pistol, well I took a shell in the eyebrow and got a nice cut. Well I have been researching SBR uppers, and cannot find a Company who makes a 9mm SBR upper. Anyone heard of anyone making these, or know of one that has interchangeable ejection? I really don't want to go to the ar57 due to ammo cost. I can shoot right handed, but seriously what's the point of spending all the Cash to custom build a rifle that I cannot feel comfortable shooting. Any help would be grateful guys!