AR UPPER ASSEMBLY custom builds your AR Upper using only the highest quality components from the best manufacturers. Your AR Complete Upper has matched options for optic, rail, muzzle device, bolt carrier group, charging handle, and magazine. offers a wide range of popular AR15, AR10/LR308 and AR9/PCC calibers including 204 RUGER, 223 WYLDE, 224 VALKYRIE, 300 BLK, 350 LEGEND, 450 BUSHMASTER, 458 SOCOM, 50 BEOWULF, 556 NATO, 6.5 GRENDEL, 6.8 SPC II, 7.62x39, 308 WIN, 6.5 CREEDMOOR, 243 WINCHESTER & 9MM.

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