#Gun Parts #masterpieceArmsAll9mm #MiniSeries #5.7x28mmSeries-Upgrades #MasterpieceSeriesUpgrades
AR-15 A1 Muzzle Brake for 9mm, 1/2x28. This brake is specifically bored out to fit a 9mm round but it is threaded in 1/2x28. Includes the crush washer as well. Also fits MPA 9mm with 1/2x28 threads.
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