AR-15 Upper Receiver Parts
1,671 products in all.
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148 products
Handguards & Quad Rails
115 products
Complete Uppers
121 products
Front Grips
132 products
Upper Receivers & Parts
363 products
Barrels
465 products
Muzzle Devices
122 products
Charging Handles
141 products
Bolt Carrier Groups
65 products
Gas Blocks & Tubes
147 products
Handguard Accessories
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AT3™ SPEAR XL V2 Suppressor Ready Free Float AR-15 Handguard – 12 & 15 Inch – M-LOK
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Best AR-15 Upper Receivers
AT3 Tactical provides the best AR-15 upper receivers – all in stock and ready to ship. Customize your AR-15 with ease with our wide-range of upper receivers including handguards & quad rails, gas blocks & tubes, bolt carrier groups, charging handles, upper receivers & parts, barrels, front grips, and muzzle devices.
Shop from our AT3 brand and those from top brands such as Ballistic Advantage, Aero Precision, Magpul, and more!