To fully upgrade the
SMG you will need
$1,375,000.
Easy method (for all 5 trophy-releated weapons):
Simply upgrade any weapon to the max, don't forget to confirm with
, then go ahead and complete the mission. As soon as the trophy shows up,
do not save your game, exit out of the game and reload your save, you need to go all the way back on the main-menu screen and close career. You will then have the funds to upgrade another weapon fully. Repeat this process for all 5 weapons (Silverballers, SMG Tactical, SP12 Shotgun, M4 Rifle and the W2000 Sniper) in order to achieve all of the upgrade related trophies.
Hope this helps!
