Moving to Denver

[DenverGP]

Unfortunately no. Thank you state representatives.

the law does NOT prohibit bringing in mags from out of state as long as they were purchased before the July 2013 date and owned continuously.

18-12-302. (2) (a) a person may possess a large-capacity magazine if he or she:
(I) owns the large capacity magazine on the effective date of this section; and
(II) maintains continuous possession of the large-capacity magazine.

As for owning it prior to the ban date:
18-12-302 (2) (b) if a person who is alleged to have violated subsection (1) of this section asserts that he or she is permitted to legally possess a large-capacity magazine pursuant to paragraph (a) of this subsection (2), the prosecution has the burden of proof to refute the assertion.