1. Prohibition on manufacture, possession, or transfer of any part or combination of parts that is designed and functions to increase the rate of fire of a semiautomatic rifle but does not convert the semiautomatic rifle into a machinegun (a) Prohibition Section 922 of title 18, United States Code, is amended by adding at the end the following: (aa) It shall be unlawful for any person— (1) in or affecting interstate or foreign commerce, to manufacture, possess, or transfer any part or combination of parts that is designed and functions to increase the rate of fire of a semiautomatic rifle but does not convert the semiautomatic rifle into a machinegun; or (2) to manufacture, possess, or transfer any such part or combination of parts that have been shipped or transported in interstate or foreign commerce. . (b) Penalties Section 924(a)(1)(B) of such title is amended by striking or (q) and inserting (q), or (aa) . (c) Sentencing guidelines Pursuant to its authority under section 994 of title 28, United States Code, and in accordance with this subsection, the United States Sentencing Commission shall amend and review the Federal sentencing guidelines and policy statements to ensure that the guidelines provide for a penalty enhancement of not less than 2 offense levels for a violation of section 922(aa) of title 18 of such Code if the device described in such section 922(aa) has been— (1) used, carried, or possessed during or in relation to a crime of violence or drug trafficking crime (as such terms are defined in section 924(c)(3) of such title 18); or (2) smuggled unlawfully into or from the United States. (d) Effective date This section and the amendments made by this section shall apply with respect to conduct engaged in after the 90-day period that begins with the date of the enactment of this Act.