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I am by no means an expert with the Daytona M249 gas kit yet - but I think they can not be reversed to AEGs once they have been moded with the gas kit.
In order to install the M249 gas kit - you need to drill some holes in the body of the weapon.
I am not sure if this means you won't be able to drop in a gear box again, but there is definitely mods that need to be done to make the Daytona kit work.
The gas line exits the weapon though the bottom of the pistol grip.
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