If you mean a semi-auto, they were made in the 80's and not too successful. I had several and they were quite a blaster, yet not accurate. Ammo is much better now and I got a 6" S&W 648, stainless 6-sot revolver. Took 15 pdogs with it in one day driving a field in E. Colorado!! My first was a solid 50 yards and I held the head, thinking about drop, and missed clean. My partner called the shot, I held the belly, and plopped him hard! Shoot the Remington poly-tip and Federal 30gr. Premium. Lots of fun and a great trigger to boot. Bob