<P> Open carry, as well as possession of a handgun either openly displayed or concealed in an automobile, is generally permitted without a license . However, local governments may prohibit open carry to a limited extent only in areas that are directly under the jurisdiction of the municipality such as municipal buildings, police stations, etc . If such an ordinance is written all locations affected must be posted per C.R.S 29 - 11.7 - 104 . The exception is the city and county of Denver has done so in a broad sense banning open carry in all areas of the city and county . The Colorado Supreme Court ruled that Denver's pre-existing ban may remain in force, despite the Colorado legislature's enactment of a statewide pre-emption law designed to establish uniform firearms policies across the state . When a rifle or shotgun is transported in a vehicle, there may not be a round in the chamber . </P> <P> Effective July 1, 2013, Colorado requires background checks for all firearm sales at the buyer's expense . Magazines that are capable of accepting more than 15 rounds or are designed to be readily convertible to accept more than 15 rounds cannot be sold or transferred within state limits . However, such magazines lawfully obtained prior to July 1, 2013 may be kept without restrictions on their use . The magazine restriction law also does not specifically address residents purchasing LCMs from out - of - state sources for personal use, although they may not be possessed within state limits . Colorado's large capacity magazine ban is silent on non-residents visiting Colorado while in possession of magazines that meet the state's LCM ban criteria, provided the LCMs are for personal use, and the individual had lawfully obtained the LCMs according to the laws of his or her home state . Denver city ordinance bans assault weapons and the open carrying of firearms . </P> <P> A lawsuit over the legality of the magazine ban and background check laws has been filed by 54 of the 64 elected county Sheriffs and 21 sporting and outdoor groups and Colorado companies . The suit alleges that the laws violate the Second and Fourteenth amendments, and state that the laws would be impossible to enforce . </P> <P> Colorado has state preemption of local firearm laws, except for certain ordinances enacted by the City and County of Denver . </P>

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