It could be just jammed as said above.
However the magazine springs are absolute garbage. Being 16 months might be a bit long to get a replacement, worth a shot though.
Between a few of us guys that do full time pest control we have been through a fair few, I never leave ammo in them and don't full them right up either.
I got a few springs made up by a local spring shop but even they have a limited life span.
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