Friendly Fire off. INF has levels of Friendly Fire penalty as it s called in the menu. Loadouts can be changed and customized to your desires as well. However you can switch out the Desert Eagle for the Beretta. The more you carry the slower and more cumbered you will be.
Weight is measure in bulk .
This is just a number. The higher the heavier. Credits are also issued from the start. These are just to help even out the loads of everyone. Each item costs an amount of credits.