For 20 bucks not bad so far - NcSTAR Gun Accessorie - Pistol & Rifle Laser With Weaver Base APRLS

Haven't had the chance to shoot with it yet. The four screw sighting in not hard just in a bad placement. I couldn't really adjust the top screw while it was mounted on the gun where I wanted it (on off switch and finger reach). But not bad enough not to order another
Pros: cheap seems bright enough for a red dot
Cons: sighting in

This review was written in the old system and had content requirements that are different than reviews written today.