Previous AR-15 style carbine/rifle manufacturer located in Kalispell, MT until 2015.
SI DEFENSE, INC. Models
.308 Win./7.62 NATO cal., 16 1/2 in. parkerized barrel with SI DRK muzzle brake, A2 style fixed front sight, carbine length gas system, billet upper and lower receivers, SI Defense carbine handguard, 6-position adj. buttstock, black finish. Disc. 2014.
.223 Rem./5.56x45mm cal., internal GIO, 16 in. parkerized barrel with SI DRK muzzle brake, A2 style fixed front sight, flip-up rear sight, billet upper and lower receivers, custom carbine length handguard, available in black, FDE, or ODG finish. Disc. 2014.
.308 Win. cal., 16 in. M4 contour barrel with SI Defense DRK compensator, 20 shot Magpul mag., Weaver extra tall scope rings and Nikon 3x9 power scope with BDC reticle, free floating carbine length tube handguard, SI Defense adj. quad rail gas block, adj. 6-position Choate stock, FDE finish, 9.1 lbs. Disc. 2014.
.223 Rem./5.56x45mm cal., internal gas block system, 18 in. stainless steel fluted barrel with SI DRK muzzle brake, flip-up front and rear sights, billet upper and lower receivers, black mid-length handguard, Ace stock, black finish. Disc. 2013.
5.56x45mm cal., 18 in. parkerized barrel with SI Defense DRK muzzle brake, flip-up front and rear sights, billet upper and lower receivers, custom handguard, Ace buttstock, "Don't Tread On Me" engraving, custom Timney skeletonized trigger group, extended charging handle latch, red and white colored lettering. Disc. 2013.
5.56 NATO cal., nickel boron coated bolt carrier group, 16 in. M4 contour Nitride coated barrel with muzzle brake, 30 shot Magpul mag., Magpul MBUS flip-up rear sight, YHM flip-up front sight, 6-position adj. stock, Magpul MOE handguard, standard black or FDE finish, 7 lbs. Mfg. 2014 only.
5.56 NATO cal., 16 in. M4 contour Nitride coated barrel with muzzle brake, 30 shot Magpul mag., 6-position adj. stock, 15 in. floating handguard, Hogue grip, fixed front and adj. rear sight, standard black or FDE finish, 6 1/2 lbs. Mfg. 2014-2015.
5.56 NATO cal., AR-15 style, 16 in. barrel, carbine length gas system, black Nitride bolt carrier group, folding front and flip-up rear sights, Magpul CTR stock, 6.4 lbs. Mfg. 2015 only.
.308 Win. cal., 18 in. Proof Research match grade carbon fiber barrel, Fortis Red muzzle brake, 20 shot mag., flared magwell, CMC trigger, integrated trigger guard, MFT stock, 15 1/2 in. lightweight free floating KeyMod handguard, hard black anodized billet receivers, forward assist, ambi controls, quick snap dust cover, 8 1/2 lbs. Mfg. 2015 only.
.308 Win. cal., 16 in. stainless steel black Nitride barrel, SI DRK muzzle brake, 20 shot mag., flared magwell, STD trigger, integrated trigger guard, MFT stock, 15 1/2 in. lightweight free floating KeyMod handguard, Battle Arms development selector, ambi billet receivers, ambi mirrored controls, forward assist, quick snap dust cover, ambi charging handle, 8 1/2 lbs. Mfg. 2015-2016.
.308 Win. cal., 16 in. stainless steel barrel with black Nitride finish, 20 shot mag., billet upper and lower receiver, flared magwell, forward assist, SST, integrated trigger guard, rifle length gas system, Magpul MBUS sights, Midwest Industries handguard, Magpul CTR stock, Hogue grip, 8 1/2 lbs. Mfg. 2015 only.
