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Alexander Arms 6.5 Grendel Upper Receiver Build Kit. Includes Mil-Spec flat top upper receiver with port door and forward assist installed, stainless steel fluted barrel threaded 5/8-24 RH, complete bolt carrier and 6.5 Grendel bolt, .875 low-profile gas block with set screws, standard length gas tube with roll pin, Mil-spec charging handle, and one 10-round magazine. Caliber: 6.5 Grendel. Gas system: Carbine Length. Threads per Inch: 5/8x24. Muzzle Device: None. Color: Black. Gun Type: Rifle. Gun Make: AR Platform. Gun Model: AR-15. Included Accessories: 10 RD Magazine. Magazine Included: Yes. Barrel lengths available: 11 in (twist 1-7.5), 18 in (twist 1-7.5), 20 in (twist 1-9).
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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