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This Bear Creek Arsenal BC-10 AR-10 complete upper features a 20 inch 416R stainless straight fluted heavy barrel with a 1:10 twist and rifle-length gas system. It includes a 15 inch MLOK split rail, an M4 flat-top forged upper receiver, a BCA AR-10 bolt carrier group, a flash hider, and a rear charging handle. This .308 upper is compatible with 1st gen DPMS low profile lowers. Magazine not included. Thread pitch is 5/8 x 24. Color is anodized black. Weight is approximately 8.25 lb.
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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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