Finding & assembling one time usage epic weapon?

Hello everyone.
Short story about my idea.
Just watched a video about new machine and saw there is new item for mission I guess (( which looked like part of weapon) and esspecially by its name tracking device…) and that gave me an idea / sugestion.
So the idea is getting random parts from epic machines like Rivals, Reaper or even new machine, so when you have all parts you could assemble epic weapon? one usage? like I don’t know javelin? / epic rail gun? or something else. Anyway would be great to assemble a weapon which isn’t easy to get, but when you get it would be very usefull.