Unlike the RMC, there are no sharp prongs on the end of the Surefire. The top ports on the Surefire are roughly the same size as the ones on the Rainier Arms RMC. This counterbalances the natural muzzle rise experienced by shooters. On the top of the brake, there are two small ports for venting gasses up. The ability to do so is a curse rather than a gift. So this muzzle brake is capable of taking massive amounts of corrosive residue from the nasty Soviet surplus 5.45x39mm I shoot, and that’s a worthwhile consideration, since it’s to be permanently attached to a barrel. Seriously, I’m actually writing these reviews in concert. I’m writing a review an IonBond treated bolt carrier group by Black Dawn right now, in fact. Personally, I love melonite (QPQ), but IonBond is growing on me. I’m a huge fan of protective coatings, as they increase corrosion resistance and prolong the life of components. Machined from heat-treated stainless steel, it’s black Ionbond coated. Before I get to the gory (in a very good way) details of performance, we need to talk about the construction of this thing. The muzzle brake arrived and I opened the package with greedy hands. SFMB-556-1/2-28 next to M4SDII Muzzle Brake I say “older” but really, the newer version has only been shipping to dealers for about a month. To be truthful, I would have been just as happy to settle for something like one of their older MB556k units. Lo and behold, there was something in my inbox from Surefire, asking if I was still interested in the SFMB-556-1/2-28. That day, I did what I always do when getting online: checked my email. Finally, when I could bear it no longer, I decided to buy the thing. I waited, stewed, and tested products from other companies. Naturally, I heard nothing back from them. That said, I sent off a request to Surefire, explaining how I wanted to test their muzzle brake. Honestly, most of my dealings are with companies that are not as massive and well-established as Surefire. I read reviews, compared prices and lusted after the 5.56mm version. Like everyone who has ever watched Chris Costa (or a host of other high-speed, low-drag, tactical dudes), I saw him using a 14.5 inch AR-15 upper equipped with a Surefire muzzle brake. I found myself looking for a brake to permanently attach to a 14.5″ barreled upper I was building. Previously, I’ve reviewed muzzle brakes from Griffin Armament and Rainier Arms, finding them to be quite effective.
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