Don't choose two from the same game if you can but you can choose more than one from a series.
1. Electro tool - TimesSplitters 2 2. Shotgun - Halo 2 3. L86A2 - Battlefield 3 4. Monkey gun - TimeSplitters Future Perfect 5. Ronin - James Bond night fire (Not really a gun but a deployable mini turret in the shape of a briefcase)