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This Bear Creek Arsenal AR-10 complete .243 rifle length upper has a 20 inch 416R stainless steel heavy barrel with a 1:8 twist and rifle length gas system. It includes the 15 inch MLOK Split Rail handguard, an M4 flat-top billet upper receiver, a BCA AR-10 bolt carrier group, a flash hider, and a side charging handle. Magazine not included. Compatible with 1st gen DPMS low-profile lowers.
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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.
12 min read
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.
6 min read