I bought this to create a sort of hand cannon and attach a compact grenade launcher to my AAP-01. It was easy to install, fit well, and looks great. The fact that the outer barrel is two pieces also allowed me to use a small diameter suppressor as an outer barrel, which looks incredible. My only complaint about this rail kit is that with the accessories I mounted on mine, it almost needs a sturdier upper receiver. The rail itself is so sturdy and robust that pulling on it or twisting it can cause the plastic upper receiver to bend a bit. Basically, getting this will make you want to treat your AAP-01 better and upgrade it further. I see this as an absolute win.