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Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. .40 S&W 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.
4150 CMV steel
1-in-16″ twist rate
Choice of .578-28 or 5/8x24 Threading
QPQ Nitride treated
.75″ (medium) profile
QC10 .40 S&W 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.
Note: 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.
*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.
|BARREL LENGTH||10.5 INCH, 14.5 INCH, 16 INCH, 3.5 INCH, 5.5 INCH, 7.5 INCH|
|Thread||.578-28 , 5/8-24|