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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.

NOTICE: Our offices were closed for the Christmas and New Year's Day Holidays from December 23, 2017 through Januaruy 1, 2018. Orders placed in this period will begin shipping on Tuesday, January 2. Please be patient as we get caught up, as it may take a week or more to get some orders shipped. You will receive a shipping notification and tracking info when your order ships out.