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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: ffl@quartercircle10.com or Fax 520-337-6730.


  1. Quarter Circle 10 .45 ACP Bolt Assembly
    .45 ACP Glock Style Bolt Assembly
    Special Price $225.21 was $264.95
  2. QC10 Ranger 9MM Pistol - Glock Mags - 7.5
    Ranger GSF 9MM AR Style Pistol
    As low as $1,351.46 was $1,589.95
  3. Quarter Circle 10 CLT9MM Lower Receiver
    CLT9MM Lower Receiver Blemished
    Special Price $205.91 was $242.25