Sig Sauer M400 Direct Impingement 5.56 NATO 16 in 30+1 Moss Green Cerakote

The SIG RM400SDI16BMSGRN is a rugged entry in Sig Sauer's M400 SDI series that blends proven AR-15 ergonomics with a mid-length direct impingement operating system and a 16-inch chrome-moly barrel chambered in 5.56 NATO for reliable, follow-up shots and consistent accuracy at typical duty, range, and hunting distances. With a 1:7 twist rate and a 1/2"-28 threaded muzzle fitted with Sig's Flash Hider-Compensator, this semi-auto rifle stabilizes heavier bullets for longer-range performance while offering reduced recoil and muzzle signature for fast target transitions; the optics-ready upper, M-LOK Moss Green Cerakote forend and accessory rail let you mount scopes, lights, and grips to tailor the rifle for patrol, competition, or varmint work. The Magpul MOE-SL 6-position stock and reduced-angle grip deliver comfortable, repeatable cheek weld and control across shooting positions, and the SIG 2-Stage Matchlite Duo flat trigger plus ambidextrous safety make precise shot breaks and safe manipulation straightforward for right- or left-handed shooters. Finished in Moss Green Cerakote on aluminum receivers, the RM400 SDI balances a 7 lb carry weight with a 33.25—36.5 inch overall length for maneuverability in brush or close quarters while preserving long-range capability.