Complete 40 S&W Upper Receiver Assembly


Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. Complete .40 S&W Glock Pistol MUR Upper Receiver

Available on backorder



Designed specifically for pistol-caliber AR builds in conjunction with VLTOR

Mil-Spec construction

QC10 PMUR Upper Receiver

.40 S&W QPQ Nitride-Treated barrel

Glock Magazine Compatible .40 S&W bolt

KeyMod Handguard

VLTOR Gunfighter Charging Handle

QC10 Pistol Caliber Muzzle Device

Made For the AR Platform- Not Modified

*This product is not compatible with DI gas systems or rifle-caliber bolts


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.