magnetospeed and revolvers

jimmy.jet

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Anyone used magnetospeed V3 on a revolver? The adapter for rail mount should work on my Sigma and Glock21. But I'm unclear about GP-100 w/4" barrel and Model 10 w/ 3" barrel.
 
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I have used mine on 8 3/8", 6" and 4" barrel revolvers both with full and half underlug barrels. The 4" full underlug is what I'm thinking is the minimum, it strapped to the barrel fine but the ejector rod would stop the cylinder from opening with it strapped to the barrel.
 
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What is it?

Barrel mounted chronograph. Here's their website. Benefits over traditional is that you don't have to setup any equipment downrange. I went alternate route with LabRadar, but technically it's not a chronograph it's a Doppler radar. Works fine with everything I've tried; indoors/outdoors - doesn't matter.
 
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