Quarter Circle 10 known for their pistol caliber ar-15 platformed firearms and components rolled out a new upper receiver.
The Billet Rear Charging Upper receiver.
Quarter Circle 10’s rear charging upper receiver was specifically designed for pistol caliber builds.
This upper sports a widened ejection port for larger pistol caliber cases.
Made of 7075 billet aluminum and weighing in at 7.54oz (stripped.)
MSRP of 199.95
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