Quarter Circle 10, The AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts.
Shipping: All orders are shipped within 72 hours Monday -Thursday 6am - 4pm Arizona Time.
Any order containing a lower receiver will not be shipped until we receive a copy of your FFL. Once received regular shipping policies apply. Submit your FFL Here.
Returns: Quarter Circle 10 offers a 30 day return, refund and exchange policy. See Details.
Made for not modified to use small frame Glock magazines. The Ranger complete lower has last round bolt hold open and accepts standard and higher capacity magazines.
• SB PDW brace
• Mil-spec Receiver Extension (Buffer Tube)
• Mil-spec Lower Parts Kit
• Enhanced Mil-spec fire control group
• Magpul MOE grip
• Ambidextrous Safety
• QC10 Adjustable Pistol Caliber Buffer System
• Springco XP (Red) AR-15 Buffer Spring
Important Warranty Note: If you intend to register your Quarter Circle 10 firearm as an NFA weapon, test it thoroughly before doing so in a Title 1 Configuration. Once you Form 1 or Form 2 it, you are legally the manufacturer, and we cannot service the firearm. Should your firearm require warranty replacement we can only replace it with a Title I receiver and we are not responsible for tax stamps or NFA fees.