Installed on Keltec PMR 30 pistol. Very easy installation and fits well. Did not use pressure switch, using only manual on off switch. Battery life seems to be OK so far as Barska has a large battery. Visability at night at least 400 yards.
Pros: Easy to see in bright daylight
Cons: Adjustment screws not tight enough
This review was written in the old system and had content requirements that are different than reviews written today.