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6-Position Telescoping Stock
Starting with the SIGM400 carbine, the Sig Sauer improved take on the direct impingement AR-style rifle, a B5 Systems SOPMOD 6-position telescoping stock, pistol grip, and KEYMOD carbine handguards are added in foliage. Featuring 1:7 twist with Nitride treated barrel, the SIGM400 B5 carbines are machined from 7075-T6 aircraft grade aluminum and are finished in hard coat anodize finish. Comes with Sig Sauer locking flip-up rear sights and has a M1913 Picatinny flat-top upper receiver.