Just to elaborate on the comment Amos made, the stunt studios M4 does not use a standard version 2 mechbox, it uses a smaller all plastic made mechbox which does not have the same dimensions of the standard V2.
Attempting to place an upgraded spring into the plastic mechbox will surely cause great stress on the already broken mechbox.
Options at this time are extremely limited, you cant even buy a new V2 mechbox and drop it in to the receiver due to the fact that the stunt studios body is smaller than that of a standard airsoft armalites.
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