Hi, I am pretty new the th HK world. I have some questions on building a HK UMP from a HK USC. I am not looking to make it full auto. I am going to SBR the USC. I just need a parts list that I would need to convert the USC over to the UMP. I have seen the UMP parts kits for sale for around $1600- $1800. I would probably buy the parts one by one when I can find them. I Don't have all that money to shell out at once. if any of you guys could shed some light on a list of parts that I would need, I would greatly appreciate it! Thanks for your help in advance!