Framing gun always leaves 4 nails, Normal?

Joined
Jan 20, 2017
Messages
922
Location
NJ
I have a Campbell Hausfield Iron Force framing gun. I have Grip-Rite 3 1/4" and Metabo 2" framing nails connected by plastic. Either nail, always 4 nails are left and won't fire until I replace with a full rack.

Is this normal, usual?

Would paper be any better?
 
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