They have a tendency to direct muzzle blast back toward the shooter.I don't find it significant but some people don't like it at all. Personally I'm not a fan of them although they definately work to some extent, I just can't tell if they work better than the AK74 brake. Primary Weapon Systems makes a few types of them for AK's and AR's. To get something that might be as good or better you need to look into aftermarket brakes like the FSC47. At the same time there aren't a lot of traditional combloc brake options in 14x1 and really none of them are as effective as the 74 brake anyway. It's so successful that the Russians have adopted it for almost all modern AK's since approximately 1992. The AK74 brake is a proven device that significantly cuts down on muzzle rise for all calibers. There will be enough barrel left exposed for you to thread 14x1 if you want but I'm personally not a fan of doing that. The process is the same for either of them and neither one takes long to do yourself. OTOH you do have the option to replace the sporter FSB with an AKM FSB instead of a 74. All in all I'd say 14x1 is more common in sheer numbers of AK's in the US, but there has been a steadily growing market for the AK74 FSB too, they are very common these days. And you see they make them in 14x1 for AKM style rifles as well just like you linked to. They are probably the most popular muzzle attachment I can think of for the AK, so popular that US versions are made as well. There are plenty of combloc brakes and flash hiders available.two kinds of AKSU boosters, at least one flash hider and the ubiquitious AK74 brake we all know and love. The giveaway in the photo is how sharply tapered the brake gets in the back. The one you linked to is the standard AKM 14x1 threading and won't fit the larger AK74 threads. I don't think you can thread the sleeve itself for anything.actually I can't recall anyone who's tried either.
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