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.45 ACP Barrels

Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. .45 ACP Barrels

As low as $180.00
Availability: In stock

  • Proprietary Feed Ramp, contoured specifically for .45ACP ammunition, ensures feed reliability and increased ammunition compatibility. 

  • .578-28 Threading

  • 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.

More Information
Thread .578-28
Model / Caliber GLF .45ACP
Caliber .45 ACP
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