by Sig Sauer
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Sig Sauer M400 SDI 5.56 NATO Semi-Auto Sentry Rifle Package. Ready-to-go AR-15 platform package including the M400 SDI rifle, ROMEO5 GEN II red dot sight, FOXTROT-MSR full-size light, and a vertical foregrip. Includes upper and lower receivers, 5.56 NATO barrel, bolt carrier group, charging handle, handguard, stock/brace, and other standard components to form a complete rifle. Ideal for home defense, training, and recreational shooting.
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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