NS150C (Type 1) Porter Cable Nailer - Overview

1. Use belt clip on staple gun to hold in place on workbench.
2. Use a hammer with a punch or small screwdriver to hit the two pins holding the end cap to the magazine. Repeat ad nauseum with as much force as you can muster until both pins come out and the broken end cap can be removed.
3. Align new end cap on magazine and use same procedure to drive pins. Exercise caution with the shorter of the two pins. If not perfectly aligned, the plastic tabs on the end cap can easily break off.