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The question I have is,... say I do put a RDIAS in my AR it is now registered right? So now, if I want to make the same rifle SBR do I have to register and pay excise tax for that too?
Just curious....
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ERm, not sure what you are asking but...
The RDIAS is the 'machine gun'.
It makes any rifle it is installed in temporarily a 'machine gun'.
A 'machine gun' is a specific item in the NFA.
A 'machine gun' is not an SBR, or a Rifle, or a Pistol, or a AOW.
So while thre RDIAS is in the rifle no you dont have to do paperwork to 'SBR' (or worry about 'evil features') the 'temporarily not a rifle but a machine gun'. Now if you take the RDIAS out of a firearm that without the RDIAS would be considered something other than a 'normal' rifle or pistol (ie, if it would be considered a SBR, or a AW, or AOW - and if it would be considered a pistol it better not have EVER had a shoulder stock, in any form), you have committed a federal crime.