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EPC-9 Upper Receiver with Atlas R-One Handguard. 9mm CMV barrel options include 5.5 in (1/2-28 thread, 1:10 twist) and other lengths. Barrel: Chrome Moly Vanadium with QPQ finish. Upper is machined from 7075-T6 aluminum; features last round bolt hold open; accepts most AR-15 upper nuts and handguards; standard AR-15 takedown/pivot lug. Does not include BCG or 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.
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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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