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Lasernerd said:
A simple swap with a Green 532nm module?
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I'm sure you could fabricate something up, but for this application, aren't red lasers better?
Think about all the shock and vibration the DPSS unit would go through each time you pulled the trigger, being attached directly to the underside of the weapon.
The red laser is simple, its a board, diode, lense, and some batteries, and the diodes, in my experience, are very tough.
The green lasers consist of the board, 2 AAA batteries, the diode, then the entire crystal assembly. It may get jarred up quite a bit, as its not built to do much more then point. Its not quite as tough.
edit- I found this on Google, they claim to be the first to make one.
http://www.airsoftarms.com/viewproductdetail.php?ProdID=5693&ID=Froogle
heres another, with more info. seems to be pretty big!
http://www.centuriontactical.com/laser-sight-green.htm