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Of the ARs I own there isn't one of them that even comes remotely close to having a .015 gap. Yes I've seen many that actually rattled but they are a far cry from anything quality. I know of no competitive shooters willing to tolerate such inconsistencies. For off the rack weapons Rock River has proven to have the best lock up of any but they can all be correctly fit and should be without gimmicks like wedges, eccentric pins and the like. Like I said, the wedge is a band-aid repair. If that is the best you can do in most cases it may get you by.
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OS, I won the 2005, 2006 and 2007 High Power Rifle National Championships at Camp Perry, OH. You are incorrect. Wedges are not band-aids. They were designed for NRA High Power. The rifle I won with is a custom Larue Tactical it used the wedge and O ring method as well. Larue's are set up tighter than Rock River's, I own both and many other brands. I have never heard of patching up a rifle, with these, then again I've never owned one that needed patching up. BTW that is a .015" is the width of a hair, very acceptable in a service rifle.