Milwaukee 15 gauge fuel nailer jammed

Hi,


My 15 gauge angle nailer is stuck. There is no nail that is jammed in there. The metal piece that drives the nail will not go back in. Has this happened to anyone and is there anything I can do to fix it?


Please help.

I didn't find the right solution from the Internet.

References:
 forum.toolsinaction.com/topic/13785-milwaukee-15-gauge-fuel-nailer-jammed/
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Thanks