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Gas block for AR-style rifles. Replaces the front sight to provide a low-profile gas block that can mount a rifle-length forearm to a carbine-length barrel. Includes mounting options YHM-9383 (two set screws) or YHM-9384 (two clamping screws). Specifications: length 24.13 mm, bore diameter 19.05 mm. Material: steel. Finish: MIL-SPEC phosphate coating. Made in the USA. Does not include roll pin.
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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