Okay newbie here , so i just picked up my USC and came into about $1500 extra money . I dont really want to SBR and completly convert into the UMP format right now at the moment because of lack of money. all i want to do is just turn my USC into the 9mm part of the UMP and do everything else later when i get the money. what exact parts do i need to make this happen? and is $1500 enough to do what I wanna do? I was looking at HKparts.com and wasnt sure if i needed the complete $2900 parts kit to make it 9mm. or the like $900 package to make the gun shoot 9mm. I really appreciate the help. thanks.