Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low View: 21 42 All Add to cartUpper Receiver AssembliesAR-STONER AR-15 Optics Ready Upper Receiver Assembly 5.56x45mm NATO 16″ Barrel 1 in 7″ Twist | AMMO GATE $303.04 Tax Rated 4.00 out of 5 Add to cartUpper Receiver AssembliesAR-STONER AR-15 Slick Sided Billet Upper Receiver Assembly Gen 2 5.56x45mm NATO 16″ Barrel Carbine Length 15″ M-LOK Ultralight Handguard Black |… $329.99 Tax Rated 5.00 out of 5 Add to cartUpper Receiver AssembliesColt AR-15 Pistol Upper Receiver Assembly 5.56x45mm 14.5″ Barrel Monolithic Rail | AMMO GATE $1,099.99 Tax Rated 4.50 out of 5 Add to cartUpper Receiver AssembliesGeissele USASOC URG-I Near Clone AR-15 Pistol Upper Receiver Assembly Improved Complete 5.56x45mm NATO 10.3″ Barrel with Surefire SF4P | AMMO GATE $1,450.00 Tax Rated 5.00 out of 5 Add to cartUpper Receiver AssembliesGeissele USASOC URG-I Near Clone AR-15 Pistol Upper Receiver Assembly Improved Stripped 5.56x45mm NATO 14.5″ Barrel | AMMO GATE $979.00 Tax Rated 5.00 out of 5