[Drake]

FMU has always been Full Metal Upgrade.

It should only apply to stock plastic guns that have received a full metal makeover. Using it for Glocks and stuff with synthetic lowers... through technically correct, is kinda cheesy.

Either way, a full description should be given in the sales thread (or asked for by potential buyers).

As always, it's Buyer Beware; perform your due diligence.


edit: you know, I'll tag on my own peeve on the matter.

Adding a metal receiver to a plastic (such as TM) gun isn't a "full metal upgrade" if you're leaving behind a bunch of plastic bits that should be metal (such as controls). A TM Beretta, for example, also needs a new lanyard loop and mag release.