We are specialty weapons manufacturer and industry resource for Pistol Caliber Carbine products. All Quarter Circle 10 products are “Made for – Not Modified,” to accommodate the AR15 platform, creating an aesthetically superior look and top rate performance standard. At Quarter Circle 10, we are dedicated to providing shooters with high quality performance and unmatched customer service. We build dedicated pistol caliber AR parts, packages and complete guns. It is what we do. It is the only thing we do. We do it the best we possibly can. And, we guarantee it to work the way we want our own weapons to work.