Great product - Mars Trigger MP5 Lower w/ AR Super Safety Trigger

People having issues are causing them this product is great . You can not dry fire the lower when it is off of your firearm, the hammer will strike the body of the lower and damage it. They are made from carbon fiber and very strong. I have one on my Mac5 every aftermarket part especially frt's take some level of knowledge and tuning. For mp5 and clones it is mostly minor fitment of the trip clearance to denial block any one can do it just take your time and do your research it is worth it.