Push the Barrel wrench down over the barrel bushing, pressing the recoil spring retainer down to unlock the bushing, and rotate clockwise.

Spring is under alot of pressure, ensure you keep firm pressure on the retainer as you rotate and slowly lift up to avoid retainer from flying across the room or in your eye!

Set retainer aside and rotate counter-clockwise on barrel bushing (its loose now) until locking tab is pointing at the spring, then lift it out.