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One morning, during a Chinese fire drill, I put on the wrong pair of boots. We were to wear the dot pair every other day as to not wear out a pair from wearing them always. On the upper rear of one pair of the boots was a white dot painted onto them. This misunderstanding turned my arms and legs to rubber, but as much of an A hole that guy was to me I know he was correct. To this day over 3 decades later I refer to the thing screwed on the end of the M16, AR, M4 or any other variants as a "Flash Suppressor". Since muzzle flash can't possibly be hidden (the business end is wide open) and my Drill Sgt made me do several exhausting 8 count pushups for not knowing the proper nomenclature (according to him). A true muzzle brake with ports on the top or angled side ports would be more effective.
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Rastoff is probably right in the muzzle rise prevention effectiveness being minimal. I'm not really sure combating muzzle rise was really a consideration in the design and is probably more of an after thought selling point beyond the intended dust kick up minimizing. Since the primary aim of the A2 flash suppressor is to starve the unburnt gases of oxygen, that is what it does best.
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They are the proverbial jack of all trades, master of none. And of course, the are the muzzle devices that claim to do both with an emphasis on one aspect of the other. Price paid is not refection on how well they will do. The same thing with muzzle brakes some perform very well and others not so much. I can't remember for sure on who did a comparison but it was near the top of the list in suppression performance and for as cheap as they are, one heck of a deal. As far as flash suppressors go, the A2 bird cage does a pretty good job. Meaning some do their intended job better than others. Like muzzle brakes, flash hiders have varying degrees of performance.
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