AZ HB2307

Exempts firearms, firearm accessories, and ammunition manufactured and kept within Arizona from federal regulation under the interstate commerce clause, effective October 1, 2010.

Applies only to items manufactured from basic materials within the state, excluding imported significant parts, though generic parts like springs and screws may be imported.

Requires all firearms manufactured and sold in Arizona under this provision to be clearly stamped with "made in Arizona" on a central metallic part such as the receiver or frame.

Excludes certain weapons from the exemption, including non-portable firearms, firearms with bore diameter exceeding 1.5 inches using smokeless powder, explosive ammunition, and multi-projectile firearms.

Includes legislative findings asserting that intrastate firearm regulation is reserved to states under the Ninth and Tenth Amendments and that Congress has not expressly preempted such state regulation.