The Armalaser for P3AT has a serious design flaw that the company will not acknowledge or address. The bracket system that is supposed to hold the laser on the gun is mismatched to the pins that go through the unit and through the pistol. It requires several hundred pounds of force to press the pins through the bracket, an assembly step that should be done before shipping it to the customer. A machine shop quoted me $150 to build a special plate to hold the bracket while pressing the pins through so that the bracket and pins aren't damaged by all the pressure necessary. That's more than the Armalaser costs new!
I've been a gun lover for 35 years, and this is without a doubt the worst misrepresentation of a product I have ever seen. Do yourself a favor and forget about Armalaser as a viable solution for laser sighting. I cannot recommend any other laser sight for the P3AT, but I can say for sure that this one is definitely not something you want to mess with.