A vertical foregrip is not an issue in most states, whether sbr or 16" barrel. The others on here will be able to better answer the paperwork for the SBR, but the ATF has FAQs online to guide you through that. Check out their site. EDIT: It is a rifle right now, correct? Or are you talking about converting a pistol to a rifle. If it is a pistol, you'll have to wait on the foregrip.
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