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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, ½-36 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
½-36 muzzle thread pitch
SD BU9 9mm Bolt
Included in the upper receiver is charging handle and the Stern Defense 9mm Bolt which is compatible with both Glock®and Colt SMG magazines, has a Mag-Phosphate finish, and is works in conjunction with the Law Tactical Folding Adapter. The Stern Defense SD Mod 5 9mm Upper Receiver is made in the U.S.A. All NFA rules apply.