MIIIFN Operations and Maintenance Manual.pdf
Insert a clip of L Cleat fasteners into the back of the Magazine on the frame assembly.
Pull the large Slide Knob on the Assembly Pusher past the fasteners until you hear a click and release the slide. The Assembly Pusher will lock the fasteners into the Magazine. The gun is now loaded.
To remove the fasteners, pull the smaller Slide Knob toward the larger Slide Knob on the Assembly Pusher until you see the recoil spring flex, and release. You can now remove the nails.