Umerex Notos stock wobble/play

Is the drop block plug and play or were there other modifications needed? I don't see any threads on that block to attach it to the gun, just looks like a push fitting attachment 🤷‍♂️

The dropblock is threaded on both ends, remove the barrel/shroud assembly and screw the block on the gun and screw the bottle on the other end.
 
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