I love my GMR-15. I first purchased one from Shooters Connection and it was a basic model nothing to fancy. The gun looked great and ran great. I decided to have JP build me an upper with the side charger and add a few fancy parts. I also added the Modular Armageddon trigger, but ended up changing it back to the Modular curved trigger. Nothing wrong with the Armageddon just liked the curved better. I could not be happier with my purchase. I have not added a laser yet, but I do see were they can be beneficial.