I picked up an Insights M3 for my Glock 17, and I couldn't have asked for a better combonation. The M3 doesn't adversely affect the weight and functioning of the gun, which can't be said of the Surefire units. They had to re-design their new "Millenium" lights because they were causing malfunctions.
The switch on the M3 is very easy to operate and the light is VERY bright and smooth. Oh, and it's about $120 cheaper than the larger and bulkier Surefire unit.
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