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?

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.

Once a rifle is registered as an sbr can different uppers be interchanged?

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?

Given a pre-ban receiver that is registered as a sbr, can a collapsible stock be installed on a pre-ban sbr registered receiver?

Quoted:
DO NOT sell the lower until you get a letter from ATF to show removal from the register.

(5) The term ''shotgun'' means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of an explosive to fire through a smooth bore either a number of ball shot or a single projectile for each single pull of the trigger.

(6) The term ''short-barreled shotgun'' means a shotgun having one or more barrels less than eighteen inches in length and any weapon made from a shotgun (whether by alteration, modification or otherwise) if such a weapon as modified has an overall length of less than twenty-six inches.

(7) The term ''rifle'' means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of an explosive to [red]fire only a single projectile[/red] through a rifled bore [red]for each single pull of the trigger.[/red]

(8) The term ''short-barreled rifle'' means a rifle having one or more barrels less than sixteen inches in length and any weapon made from a rifle (whether by alteration, modification, or otherwise) if such weapon, as modified, has an overall length of less than twenty-six inches.