Press forward on recoil spring guide (I) with small screw driver assembly. Assembly lock (J) will disengage. Ease recoil spring (D) and guide (I) out of the slide. Lift end of assembly lock (J) up and turn lock plunger (K) 90 degrees. Work the assembly lock forward out of its grooves in slide.
Editor's Note (added): These steps are not normally necessary for routine maintenance and cleaning. In view of the difficulties I have encountered in reversing these steps, I do not recommend that this be done unless necessary to replace broken parts.