Ummmm, guys. Unless I'm really missing something here, take a close look at the pictures Lead Pipe posted of his lower. It has the bolt catch and mag release already installed, along with the pivot pin! It ain't a striiped lower! He doesn't need a full lower parts kit unless he truly wants to go that route. He needs a trigger, a safety, and a hinge pin, along with the complete buffer system, stock, and grip. Done! Just sayin' unless I'm missing something.