To re-activate the gun, ATF requires you file a fully completed Form 1 (ie you get the gun on a Form 5, including the law enforcement certification, photo and fingerprints. You have to do all that again for the Form 1), and pay the $200 tax the gun was exempt from before. Then when that is returned approved you can break the welds off the receiver, and install a replacement barrel, or get the weld out of the barrel, if a spare cannot be found. In the alternative, a Class 2 manufacturer may re-activate the gun, and file a Form 2 reflecting the gun is now live. ATF considers re-activating to be manufacturing, and requires the re-activator to mark the gun with his name and address, whether done on a Form 1 or Form 2. If you sent your DEWAT to a Class 2 to make live he would have to transfer it back to you on a fully completed Form 4, as a tax paid transfer. These procedures are not in the NFA law nor the regulations. They are apparently based in part on the Revenue Rulings that created the DEWAT program in the 1950′s. As a DEWAT was not a NFA firearm, before 1968, requiring the making tax made sense then as you were making a machine gun out of something that was the equivalent of a door stop, legally. Now that is not true, the DEWAT is a machine gun, and no making tax should attach, as you are not "making" anything, merely changing the gun from unserviceable to serviceable.
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