It's also worth noting that knockback protection can come from IO set bonuses. Three Gladiator's Javelin IOs in a single-target ranged attack will give you Mag 3 knockback resistance, as will three Fury of the Gladiator IOs in a Point Blank Area of Effect blast (such as Energy Blast's Nova, Fire Blast's Inferno, etc.). It's a bit less than the Mag 4 resistance granted by the IOs previously mentioned, but it's another source of KB protection to consider, and will stack with any other source of knockback protection. From Devices, Gladiator's Javelin can go into Gun Drone (and theoretically Taser, but you'll *probably* want to slot it for Stun rather than damage), and Fury of the Gladiator will go into Trip Mine as well as Time Bomb.