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Yankee Hill Machine AR-15 Gas Block, .750 bore, low profile steel gas block with mil-spec phosphate finish. This gas block replaces the front sight to allow mounting of a rifle-length forearm to a carbine-length barrel. It is mounted by two set screws. Made in the USA. Bore diameter: .750 in. Length: 0.95 in (24.13 mm).
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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 explanation of gas system length tradeoffs, port pressures, and how these design decisions affect reliability, recoil, and parts wear.
5 min read