this is a bad design--the laser does not fit entirely into the arbor--it fits into less than a quarter inch inset, and rocks loosely. When inserted into a Glock or SIg pistol, the slide will not close even part way. Bad design and does not do what it is designed to. Don't waste your time or money.
Pros: simple design
Cons: will not fit in gun, loose fit so inaccurate aiming
This review was written in the old system and had content requirements that are different than reviews written today.