It fit perfectly for my lower - AIM Sports Inc AR Complete Lower Parts Kit

I needed a trigger for my build and when I saw OpticsPlanet's price I had to grab it ASAP as this type of trigger is hard to find. I always ♥ it when OpticsPlanet has the best price for things and end up buying from them in end. As for the trigger, for me it was a simple drop. A little assembly but not rocket science. I did a few dry fires to test it out. Nice release and feel. Definitely recommend �