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   | (520) 269-6464CONTACT US

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Welcome to Quarter Circle 10

We are an innovative firearms manufacturer specializing in pistol-caliber AR-15 platforms. It is our goal to provide the highest quality Pistol Caliber weapons and components on the market, and the service our users demand and deserve. Our weapons are American designed, manufactured, and built to exacting standards, and we don’t sell anything we wouldn’t trust with our own lives.

When ordering a Lower Receiver, please have your local dealer email or fax their FFL with your order number and name to: or Fax 520-337-6730.

Side Charging Upper Orders may have up to a two-week lead time during the 4th of July Sale. Thanks for your patience!