Starting Device - Pistol

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Hopefully a few people actually reply to this, it has been dead for a while.

I was wondering if swimming officials(track also I guess) ever use real guns for meets; obviously using blanks, for starts, the 500, recalls, etc. I have a real crappy starting pistol but falls apart now and then, and is not reliable. But I also have a couple of reliable Glocks, and I can get blanks for them pretty easily.

So I guess I was wondering what people say about this,like the legalities (how I could make it legal; like painting one clip orange for blanks only, wrapping orange tape around the end of the barrell). Ideas, anything?