The Unimax is nice but hard to keep clean. That little lense is too close to all that burnt powder. You will need to use a fine tip eraser to get it off and even then you wont get it all off. I took mine off my handgun and put it on a rifle. IMHO Green lasers on a pistol are a bit of overkill, they are cool and work well but I have learned that at the effective distances of a handgun the red laser is more than adequate. Did you consider a light laser combo like a TLR2 or M6X? I does everything the others do at the correct distance and gives you the added benefit of a light and saves you some $$. I have gone that route with my HD pistols and put the longer distance beams on my longer distance rifles.

If you must go green consider a Viridian as well.