45acp, selective fire. The local range I use bans fully automatic weapons but will let use this one set on single fire. This came in handy when I was checking and adjusting my magazines. I have to go to Knob Creek if I want to shoot it fully auto. Short bursts work best, long bursts and it wants to keep climbing no matter how well you brace or lean forward.
This is the only auto I own and I got it and several cases of full metal jacket rounds for it when they were still relatively cheap. I couldn't afford or justify buying enough ammo or another like it now.