AFAIK there arent any good ones out there, just the usual NC Star, Leapers etc. The bores are large enough that you wont get any bullet strikes unless it comes loose, at which point the garbage disposes itself from your rifle. Fitting varies from brake to brake, some will slip on loosely while others will require minor clearancing that can be accomplished many ways. (dremel tool, rasp, even course sandpaper on a dowel) The long AKS-74 style is the best of the bunch performance wise, just be sure to use loctite and keep an eye on it while firing. The biggest PITA is removing and cleaning it each time as it is blued steel and will rust like a toyota if left uncleaned