muzzle break or flash hider

It is "Threaded" with an MB4 Muzzlebrake Martin.

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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

Threaded and has a Mb4 Muzzlebrake installed

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