Pistol-caliber carbines are all the rage nowadays and Quarter Circle 10 is no stranger to the game. They offer a full line of products dedicated to pistol-caliber carbines that allow users to put together dedicated platforms instead of having to modify existing parts to work correctly. Quarter Circle 10 was one of the first to market dedicated receiver sets for 9mm, .40 S&W, and .45ACP into AR platforms. Here we examine their latest offering, the YKMF-5, a 9mm side-charging pistol that looks like a PCC had a wild night with an MP5.
DESIGN & OPERATION
The YKMF-5 is a special build that takes popular aspects of AR pistols and mates
