The laser has a nasty habbit of shutting off each time the gun is fired. It will not turn back on unless the battery is removed. The unit went back to Barska and they charged me $10 to replace the unit that should have never shipped. The gun is a 9mm carbine so the laser is not subjected a large inertial shock each time it is fired. At least it does make people at the range laugh.
This review was written in the old system and had content requirements that are different than reviews written today.