my yhm phantom didnt look so good on my 16" ar. so i decided i wanted something a little shorter. someone warned me about this when i was looking for the can. they suggested to look into a sbr. i got notification my lower came in. do i need to buy the upper and stock before i send off for paperwork? i would prefer pick up the lower up get it engraved with the name of the trust and send off the form 1 and 4? this would allow me a few months to decided what upper and stock combination to get. thanks, liquid Wanna kill these ads? We can help!