I've got a Flow 556k in jail, after doing the typical online research and only having experience with my personal Dead Air Sandman (men?) S and K with 556 endcaps. For me, it came down to Huxwrx Flow 556k or Surefire RC3. Gas blowback was a primary consideration for me as a lefty shooter.
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Big Tex Ordnance has some informative videos to help make your own conclusions. The flow-through cans were designed with added requirement of minimizing effect on rifles that must function with or without a suppressor. If that wasn't a requirement, I think flow-through wouldn't be as much of a consideration.
Flow 556k Pros: lightweight (13 oz), short, lowest back pressure, simple attachment.
Flow 556k Cons: more flash, not best performing muzzle devices, 2500-round cleaning schedule for long life.
RC2 Pros: durable, durable, durable, great track record and manufacturer, best signature reduction, great performing muzzle devices.
RC2 Cons: heavy (17 oz), more complex locking mechanism may carbon lock, high back pressure.
RC3 Pros: See RC2 above, except track record TBD and must use open-tine (3 or 4 prong) flash hider for best signature reduction.
RC3 Cons: heavy (17 oz), more complex locking mechanism may carbon lock, price.
The reason I went with Flow 556k was for use on multiple rifles that are gas-sensitive like X95 and DI ARs not tuned for suppressed use. My Dead Airs go on PWS piston rifles that have adjustable gas blocks. If it were only for a rifle (SBR) tuned for heavy suppressed use, I think the RC2 is easily at the top.
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