I went trough several of them, not this particular brand but the same price range, some marked for weapon mount, not for airsoft, purchased also few for friends.
Sorry to say it - they all went broke after the first few hundred rounds...
I rather spend couple bucks more for Streamlight or some other brand name, than to buy another-one of those.
Hope you guys have more luck with yours, I know there is a weapon mounted light coming from Olight, it should be cheaper than most of the products on the market, my thing is: if it]s going to be Chinese, let be from a known manufacturer, again, I could be wrong...
Μολων λαβε !
Florida Glockers Club #1964
Калашников Клуб №1000