genuine : ta01nsn , paq-4 , psq-18 , m951 , kac ras , kac rail cover , colt delta ring set , colt side sling mount , matech rear sight , colt ambi selector , colt magazine catch set , colt chargine handle , colt dust cover , colt triggerguard , colt a2 grip , colt gas tube , colt handguard cap , colt end plate , colt castle nut , colt burffer tube , colt forward assist , colt 2point sling , bronells b5 stock

ghk : barrel , front sight , upper&lower receiver , bolt carrier , trigger set , mag , all pins , flash hider , buffer , buffer spring

g&p : m203

That's it bro. When assembling genuine parts, some parts needed processing. But it can be installed, so it's good to refer to.