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Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. .45 ACP Barrels
Shipping: All orders are shipped within 72 hours Monday - Friday 8am - 5pm PST
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.
Proprietary Feed Ramp, contoured specifically for .45ACP ammunition, ensures feed reliability and increased ammunition compatibility.
4150 CMV Steel
1-in-16″ Twist Rate
QPQ Nitride Treated
.75″ (Medium) Profile
Available in 5.5",7.5",10.5",16"*
Quarter Circle parts are designed to work within mil-spec perimeters. However, for optimum performance we recommend using QC10 parts for all your core elements, (Receivers, bolt, barrel and adjustable buffer system).
Made For - Not Modified. Every QC10 product is engineered specifically for pistol caliber ammunition, not modified from an existing platform, increasing functionality, reliability and overall performance.
*Barrels are measured from the end of the muzzle to the end of the breech/feed ramp. Approximately1” of the barrel rests inside the upper receiver upon installation, resulting in an installed length of 1″ less than listed overall length.
*The installation of a pistol-caliber suppressor requires the use of a fixed barrel spacer. See your suppressor manufacturer for information on the requirements of your particular model.
|Model / Caliber||GLF .45ACP|