Quarter Circle 10 is a specialty weapons manufacturer and industry resource for Pistol Caliber Carbine products.All Quarter Circle 10 products are "Made for - Not Modified," to accommodate pistol caliber ammunition, the familiarity of the AR15 platform plus superior aesthetics and top rate performance. Additionally, this design provides Quarter Circle 10 weapons broad adaptability allowing nearly limitless modification through 'off-the-shelf,' components and furniture to suit the individual requirements of the end user.