Keep in mind that these are supposed to be parts of a whole, and should not be very large. The effect that is being simulated is that the user can pick these up and have them assembled into a weapon that can be used by someone other than the player.
The rifle I am thinking of for parts is the Mechem NTW-20, and I have attached a pic of it in disassembled form so you can see the barrel, firing mechanism, scope, and stand.
DNA Computer (similar to a tablet pc):
Power Supply (similar to that of a PC):
Priest of the Church of Joe Wood