Quoted:
If you register a rifle as an sbr then do all the regulations( restrictions) that apply to an assault weapon still apply to the sbr weapon?
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YES
Pre-Ban rifle= Pre-Ban or Post ban features
Post-Ban rifle= Post-Ban features ONLY
As I understand it if you have a machine gun then the rifle falls under different regulations in which the restrictions (e.g. no flash hider, bayo lug, collapsible stock, etc.) placed on assault rifles do not apply to the machine gun.
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CORRECT, A MG is not a Semi-Auto AW.
Once a rifle is registered as an sbr can different uppers be interchanged?
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Correct, use any length upper that "flips your skirt". I have a 7.5, 11.5, and 12" for my lower.
Is it true that once a receiver is registered as an sbr it will always be an sbr and cannot be re-registered as a rifle?
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FALSE, you can write ATF and have the serial number (SBR) removed from the register back to the "Title 1" status w/16" or longer barrel, but you will lose $200. If you decide to register the same lower again,,,,ANOTHER $200 to re-register. DO NOT sell the lower as a "Title 1" until you get a letter from ATF to show removal from the register.
Given a pre-ban receiver that is registered as a sbr, can a collapsible stock be installed on a pre-ban sbr registered receiver?
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YES, Pre-Ban = Pre or Post features,
Post-ban = Post-ban features (no collapse stock)