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Multi-purpose front sight and gas block combination for AR-15 platform. Steel body with phosphate finish. Deployable front sight via spring-loaded pushbutton; folds down when not in use to maintain unobstructed optics. Protective ears guard the sight post. Mounts to standard contour barrels using a barrel clamp design. YHM-9394 version includes bayonet lug and sling swivel compatible with slings up to 1 1/4; YHM-9835A includes a Picatinny-style under-rail for lights, lasers, and other forward-mounted accessories. No sling swivel on YHM-9835A.
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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