Stern Defense Ar-15 Sd Mod 4 9mm Upper Receiver M-Lok Complete
Stern Defense Ar-15 Sd Mod 4 9mm Upper Receiver M-Lok Complete, The Stern Defense SD Mod 4 9mm Upper Receiver is a complete, ready to go, upper receiver solution for those looking to spend less time building and more time shooting. The 16.1 inch, 1-10 twist, Melonited barrel, is free float in a 12in M-LOK handguard attached to a 7075-T6 forged aluminum receiver. 16.1in barrel 15in M-LOK Free Float handguard Complete assembly with 9mm bolt and charging handle 1/2-36 muzzle thread pitch SD BU9 9mm Bolt Cartridge: 9mm Nato 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 Melonite finish, and is works in c Mfg: Stern Defense