This kit is from a used full auto Colt. Contains the full lower parts kit needed to complete a lower, minus a full auto sear. Fire control group/ safety selector are full auto, but legal to own, and install as is, and will be semi auto. Buffer tube threads are a little messed up but the castle nut still fully threads on and off. Will throw in a set of colt slim profile M4 handguards with heat shields. $200 for everything pictured. No trades