As with all 10mm Auto firearms (it seems) this is the long-awaited Stribog SP10. There is also a version in .45 ACP. These firearms use a roller-delayed blowback system to manage recoil effectively, even with 10mm. They feed from polymer magazines (UMP-patterned magazines) and are built for reliability. Great for those who want to go for a major caliber in their next PCC match!