Modern Weapon Systems precision made adjustable gas block made of melonite finished 4140 annealed steel .750" diameter.
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I have 2 , easily adjustable, can get my ar-15 feeling like I'm shooting a 22lr. Another great product by MWS.
Bought this with a barrel from MWS the adjustment is easy. Was able to tune my gun down to nearly 22lr low recoil while shooting match grade ammo. Great product and price!