Stern Defense, Llc Ar-15 Sd Mod 5 9mm Upper Receivers M-Lok Complete

The Stern Defense SD Mod 5 9mm Upper Receivers are unique with handguards that extend beyond the end of the barrels. The 8.5" barreled upper has a 10" M-LOK free float handguard, and the 6" barreled upper has an 8" M-LOK free float handguard. To bring the muzzle out beyond the end of the handguard both uppers have SD HBC 9MM Blast Can installed. Both barrels have a 1-10 rate of twist, 1/2-36 muzzle thread pitch, and a Melonite finish. 8.5" or 6" barrels M-LOK Free Float handguard Complete assembly with 9mm bolt and charging handle 1/2-36 muzzle thread pitch SD BU9 9mm Bolt Included in the upper receiv Mfg: Stern Defense, Llc