[9] In the aftermath of the Columbine High School massacre, Brown represented RMGO in national news in support of gun rights amidst calls for more restrictions on firearms.

[10] RMGO organized opposition to a 2000 state ballot initiative known as Amendment 22 aimed at closing the purported "gun-show loophole" by requiring background checks at gun shows.

The group also organized opposition and demonstrations against legislative measures supported by then Republican Governor Bill Owens to restricting firearms access,[12] and campaigned against candidates down to local sheriff that they felt undermined gun issues.

RMGO has been recognized as "a gun-rights group so strident the National Rifle Association keeps its distance,"[11] and has accused the NRA of "squandering time and money" and "kissing up to politicians.

[23] In 2010, RMGO filed a lawsuit against Colorado State University for their attempt to ban Concealed Weapons Permit holders from carry-on-campus.

[28][29] In early 2012, the group was critical of Republican State Representative Jim Kerr's support of a measure that would have restricted gun sales on Sundays.

[30] In April 2012, RMGO presence was noted Colorado GOP convention, making firearms issues a prominent topic of discussion among delegates.

RMGO's literature during the event called White's gun rights record into question and heralded Baumgardner for answering their survey 100%.

[33] In 2012, the Denver Post accused the group of failing to file required documents with the Internal Revenue Service to maintain its tax-exempt status.

[34] In 2013, RMGO assisted on the campaign to recall a Colorado State Senator, Evie Hudak, a democrat who voted in favor of more restrictive gun laws.

The challenge occurred after a local resident had been asked to leave the library after a patron noticed that the citizen had a concealed handgun on her person.

[41] In February 2023, Kevin Lorusso testified on behalf of Rocky Mountain Gun Owners during a Colorado legislature Committee session.