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NcStar Keymod Rail System is a drop-in AR-15/M4 handguard for KeyMod to Picatinny rail conversions. Designed to fit AR15/M4s with MIL-SPEC Barrel Nut, Delta Ring, and front Handguard Cap. Length options include 165 mm Carbine, 216 mm Mid Length, 305 mm Rifle Length, and 330 mm Carbine Extended. Includes two accessory KeyMod to Picatinny Rail Sections: Short 3 KM slots / 5-slot Picatinny and Medium Length 5 KM slots / 11-slot Picatinny. Black anodized aluminum construction. Weight 5.9 oz.
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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
An overview of AR-15 handguard and rail systems, comparing M-LOK and Picatinny attachment standards and the tradeoffs between free-float and drop-in designs.
7 min read