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Remington Golden Saber, at least in .45 ACP form, used to give off a heinous flashbulb quality muzzle flash.

Now stop for a minute and consider a guy who just got through selection for unit X who has had, up to this point, minimal pistol training. He now needs to be on par in pistol skill with the other...

all of the above.

Tell that to Miami SWAT...or NYPD ESU, or any number of other LE tac teams that train and function in salt water quite a bit. Again...limitations of your knowledge.

There are military units who...

You assume that no military or LE unit has ever tried a comped weapon before...which would be incorrect. In other words, your perceptions are entirely a function of the limitations of your knowledge...

Why are groups who go to some of the most hostile places on the planet under some of the most awful conditions slower to adopt a piece of equipment similar to what you saw show up at the last USPSA...

I really do need to get off my butt and do some extended work with a good RDS setup.

One of the drawbacks of the RDS is losing the dot during recoil and having to find it again...so I can see how keeping the muzzle down and the dot inside the "window" would be beneficial.