It would be really nice if, instead of having to buy a brand new set, you could change your weapon type (ACFU, ATFU, APFU, AUFU) via re-manufacturing. That is, you would pay the materials cost for the material that differ plus a small re-manufacturing fee.
– For example:
Build ATFU
8 Copper
1 Machinery Parts
1 Tungsten
(Requires 1 Advanced Factory)
Build AUFU (Requires 1 Advanced Factory)
8 Copper
1 Machinery Parts
1 Precision Parts
You have 100 AUFU, but you would really prefer to have ATFU. So you spend
100 tungsten + 10k bits (1/5 original cost) to convert them into 100 ATFU.