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I'm in Calgary
Yes it is a drop in, brand new m120 mechbox.
I tried a 8.6v battery as well, with the exact same effects, it seems to pull the spring fine.
When I was test firing the rifle was fully assembled.
On full auto each individual cycle sends multiple bbs out the barrel.
I observed the nozzle movement with the receiver separated with the nozzle clear of any obstruction.
Hope this helps a bit more.
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