Here is the manual. It is also called a Cobra
To load nails,turn gun upside
down and tilt the gun so the side
with the nail icon "T" and staple
remaining window is facing down
(Fig. 3). Load by leaning rack of
nails tight against inside of staple
chamber in housing (Fig. 3). Be
sure to insert nails with point of
nail facing upwards. The gun may
jam if nails are inserted in the
wrong side of housing.
https://www.manualslib.com/manual/794561/Cobra-8000.html?page=4
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