As of July 1, 2013, it is illegal to sell, transfer, or possess a magazine that is "capable of accepting, or that is designed to be readily converted to accept, more than fifteen rounds of ammunition." § 18-12-302(1). However, magazines owned before that date were grandfathered as long the owner has maintained continuous possession. § 18-12-302(2). This law is silent on non-residents visiting Colorado while in possession of large capacity magazines, provided they are for personal use, and the individual had lawfully obtained them according to the laws of his or her home state.
