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Turn the gun upside down while the magazine is inside and try firing.
With no magazine in the gun, fill up the hopup with BB's, turn it upside down, and try firing with an unjamming rod in the feed hole to prevent them from bouncing out.
With the barrel removed, place the hop-up on the gearbox and see if the nozzle will reach at least half-way into the bb chamber, and clear or retract COMPLETELY out of the feeding hole where the bb's come up from the magazine.
First two will isolate that it is not a magazine issue, since it's still unclear if you have 1 or more unresolved issues.
The third will isolate the suspicions of a compatibility error with the nozzle.
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