Here is a concept for a building a modding bench, this would be a weapon crafting table which has 3 levels that allow it to craft better weapons for the cost of fuel
how it would work:
step one: player places 4 blue or purple of a weapon into the bench.
step two: person puts in 100 machine parts, 50 oil, and 200 fuel. (2x for purple)
step three: player hits the craft button, and waits 1 hour +30 min per level, after which out will pop out a weapon of better quality.
example person puts in 4 blue m249's waits the time and gets either a purple or rare m249 (90% chance purple 10% chance rare)
note on purples being put into it. If a person gets 4 purples in it, they have a chance of the weapon quality staying purple but with any craft kits on the other weapons combined into the new weapon (no stacks so can't have 4 APS kits, only one would count) this is a 90% chance while the other 10% is that it is turned into a unique.
yeah just a way to craft down lower weapons to higher weapons. To not wreck economy it is expensive and most the time just improves the weapons used instead of rolling them to unique or rare.
Note this is of more use to people like me who even with a 4% shinny and 10 alliance boost rarely see blues.