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AAC (ADVANCED ARMAMENT) Complete MPW Upper Assembly 12.5" 300Blackout\n\n- 12.5" nitrided 1:7 twist barrel, threaded 5/8-24\n- AAC 51T BLACKOUT Flash Hider\n- Full Auto BCG\n- KAC URX Rail\n- Ready to drop onto your AR15/M16/M4 lower. Works with an AR lower with Mil-Spec push pin locations.\n\nIMPORTANT NOTES:\n- The 12.5" AAC 300BLK Uppers are designed for use with a carbine receiver extension, standard GI Buffer Spring, and an H2 Buffer.
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A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
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Guide
A neutral guide to component strategies for left-handed shooters, left-eye dominant right-handed shooters, and those managing eye/hand dominance mismatches. Covers ambi uppers, charging handles, gas system tuning, and real-world tradeoffs.
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