I have a 10mm AR pistol built on a Quarter Circle 10 lower and CMMG radial delay blowback 8" barrel and bolt. Midwest Industries handguard, CMC 3.5# trigger, Radian Raptor and Talon charging handle and selector, Strongarm brace and Holosun dot. 
It uses Glock 10mm magazines and comes with 3 or 4. 
It shoots almost as soft as my RDB 9mm and runs like a top.