sorry for bringing back an old thread.

i saw a recent thread about buying an upper. i used tacticool's adapter, shaved down my stops and made an m4 type upper.

anyways, i was thinking of buying a new upper and barrel. i want to make a stock upper assembly and maybe throw a scope on that one. that way i can switch out uppers for different situations.

i am going to use my stock barrel nut and handguard. as far as the ejector goes, how is it held in the barrel? what part would i need to order? thanks for any help.