Weapon Attachments/Inventory: Red Dot Sight: this sight replaces your standard iron sights with a RDS reflex sight with a small red dot (hence Red Dot Sight) that makes it easier to aim your weapon
Grenade Launcher: This allows you to fire 40mm HE grenades from your gun by pressing the left d-pad button and using R1 to fire (Replaces Perk 1)
AGOG Scope: A scope that allows weapons a longer range capability, but it causes aim drift for your weapon (crouch or prone reduces drift)
Silencer: This silences your gun and makes it so that when you shoot you dont show up on radar
Grip: Increases Accuracy on Light Machine Guns and Shotguns, (replaces perk 1)
RPGX2: Gives you an RPG launcher and 1 extra grenade
Claymore: Trip activated mine with about a 160 degree blast radius (in front of the mine) great for defending yourself if you're a sniper or setting up traps.
C-4: Remote detonated satchel charge, L1 to throw, R1 to detonate (once selected) good for defending small areas or setting up traps (double tap square with weapon equipped to detonate too)