From Surefire's site.
MB556AR
Enables attachment of M4FA or FA556AR suppressors to M4, M16/AR-15 with a barrel 12.5” or longer, and to other 5.56mm (.223 cal.) semi-auto, bolt-action, or assault rifles with Mil-Spec 1/2-28 muzzle threads and (due to overlap design) first 2.75” of barrel (measured from muzzle back) clear of obstructions and no more than .749” in diameter. This adapter functions alone as a high-performance muzzle brake when the suppressor is removed. Patented design greatly diffuses side blast, counteracts up/right muzzle movement to keep muzzle on target, eliminates felt concussion on shooter. Heat-treated stainless steel construction
I bought a few more than I needed. I have 2 on guns and they work as advertised. New, never used with all paperwork, shims, and thread lock. This is for the one I have left.
$85.00 + shipping. Paypal or Money order.
MB556AR
Enables attachment of M4FA or FA556AR suppressors to M4, M16/AR-15 with a barrel 12.5” or longer, and to other 5.56mm (.223 cal.) semi-auto, bolt-action, or assault rifles with Mil-Spec 1/2-28 muzzle threads and (due to overlap design) first 2.75” of barrel (measured from muzzle back) clear of obstructions and no more than .749” in diameter. This adapter functions alone as a high-performance muzzle brake when the suppressor is removed. Patented design greatly diffuses side blast, counteracts up/right muzzle movement to keep muzzle on target, eliminates felt concussion on shooter. Heat-treated stainless steel construction
I bought a few more than I needed. I have 2 on guns and they work as advertised. New, never used with all paperwork, shims, and thread lock. This is for the one I have left.
$85.00 + shipping. Paypal or Money order.
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