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It is "Threaded" with an MB4 Muzzlebrake Martin.

Threaded with Muzzle-brake Martin -- Midwest Industries, Semi-Automatic Rifle, 223 Wylde, 16" Barrel, Matte Black Finish, Magpul CTR Stock, 15" M-LOK Handguard, MB4 Muzzle Brake, 30Rd

Threaded and has a Mb4 Muzzlebrake installed

Hi Martin, This comes with MB4 Muzzle break. It is Threaded -- Specifications and Features: Midwest Industries AR-15 Semi Automatic Rifle MI-FN16M15 -- Distributor Exclusive -- .223 Wylde (accepts 5.56mm NATO and .223 Remington) -- 16" Lightweight Contour Barrel with Nitride Finish -- 1:8" Twist Rate -- 30 Rounds -- -- Mid Length Gas System -- Midwest Industries G3M15 15" M-LOK Compatible Hand Guard -- Midwest Industries Forged 7075-T6 Aluminum Upper Receiver -- M4 Feed Ramps -- .250 Take Down pin -- M16 Bolt Carrier Group -- Laser Engraved T-Marks -- >>>>>>>>>>>MB4 Muzzle Brake -- Midwest Industries Forged 7075-T6 Aluminum Lower Receiver -- Mil-Spec Diameter Buffer Tube -- Magpul CTR Collapsible Buttstock -- Magpul MOE Pistol Grip -- Compatible with Standard Pattern AR-15 components and magazines -- Upper/Lower features Hard Coat Anodized Mil 8625 Type 3 Class 2 Finish -- Matte Black

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