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Alexander Arms KIT6516 Upper Kit for AR-15, 6.5 Grendel. Upper kit includes Mil-Spec flat top upper receiver with port door and forward assist, a 16 inch barrel with 1:8 twist and 5/8-24 thread, bolt carrier group with 6.5 Grendel bolt, .875 gas block, mid-length gas tube, Mil-Spec charging handle, and a 10 round magazine. Does not include barrel nut or handguard. Finishes may vary (e.g., Cerakote on the receiver).
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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