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Taking the AR15 parts and accessories to new heightsTM

Quarter Circle 10 Barrels .45 ACP

Quarter Circle 10 Barrels .45 ACP
Only 4 left
Product Name Qty
Quarter Circle 10 .45 ACP barrels - 14.5" 4

Availability: In stock

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Quarter Circle 10 is proud to offer the best barrels available for the AR-15 platform. All our barrels are made right here in our shop from the finest materials available, and feature hand-polished feed ramps and chambers. We turn, chamber, and thread each barrel to exacting tolerances, and all barrels are threaded for the attachment of flash hiders, suppressors,* and accessories, and finished with a nearly indestructible protective treatment. Our barrels have a medium outer profile and come in a variety of lengths to suit any need. Our barrels feature:

  • 4140 Chrome-Moly steel
  • 1-in-10″ twist rate
  • .45 ACP .578-28 threading
  • Melonite nitrocarburized protective layer
  • .75″ (medium) profile

Now, the modularity of the AR-15 platform can be easily combined with the light weight, easy availability, and broad selection of the cartridge. Whether for home-defense, law enforcement, competition, or plinking, Quarter Circle 10 has you covered, with our philosophy of Made For- Not Modified. Each of our parts is engineered and manufactured with pistol calibers in mind, rather than modified from rifle-caliber components as an afterthought. We’re Quarter Circle 10, the AR Pistol-Caliber brand.

Note: Our barrels are measured from the end of the muzzle to the end of the breech/feed ramp. Approximately 1″ of the barrel rests inside the upper receiver upon installation, resulting in an installed length of 1″ less than listed overall length.

Additional Info

Additional Info

SKU QC10 Barrels .45
Manufacturer Quarter Circle 10
Finish No
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No


Customer Reviews (2)

No commentReview by Reese
I have not yet completed the builds, so actual performance cannot be discerned at this point. However, the barrels (and the other parts) look very good and Rainier's service and product selection is superb. Thank you and keep up the good work. (Posted on 8/21/2016)
No commentReview by Philip
- (Posted on 7/21/2016)

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