Works okay for the purpose of illuminating hallways and what not. Fired a couple of mags and it loosened up a bit. Tightened and fired a few mags again. Loosened up again. I got the rail to light my target in case of intruders and it does that but I would strongly recomend against this product if you plan to use it for a lazer sight or continous fire senarios but as far as home defense, I would strongly recomend it if your only using it for a light mount for home defense.
Pros: Serves the purpose
Cons: loosens ageter a few rounds
This review was written in the old system and had content requirements that are different than reviews written today.