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The BCA AR-10 Complete Upper Assembly has a 20 inch, 416R stainless steel heavy barrel, a rifle length gas system, and a 1:8 twist rate. The barrel is chambered in .243 Winchester and is Mil-Spec DPMS Low Profile. The assembly includes a 15 inch M-LOK Split Rail, a forged upper receiver with forward assist, bolt carrier group, flash hider, and a rear charging handle.
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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