10000 XP, Sledgehammer
Talk to Titus after finishing The Green Mile quest to start this one. Follow the mini-map until you reach Kevin, then talk to him to start the Locked Armory side quest. Once that is complete head into the Armory and take the ammo boxes to Titus to complete the quest. Talk to Titus again to start the Dante's Kitchen quest.
Striker Rifle Mod - In the first room of the Armory to the right on a desk.