Brown founded the Colorado organization Rocky Mountain Gun Owners in 1996 as a "no-compromise" alternative to other pro-gun organizations.
In the wake of the Columbine High School massacre, Colorado voters passed Amendment 22, a voter-initiated measure requiring background checks of gun purchases at gun shows, closing the gun show loophole.
Brown opposed the initiative, stating, "We're under assault right now.
We feel like the Jews did in Nazi Germany."

 In 2002, a complaint was filed against Brown with the Colorado Secretary of State, alleging that a fund-raising letter he wrote supporting the congressional campaign of Marilyn Musgrave violated state law.
 The complaint claimed that, "As a registered lobbyist, Mr. Brown is clearly prohibited from fund-raising while the General Assembly is in session."
Brown called the complaint "frivolous".

Brown is known for involving his organization in Republican Party (GOP) primary elections at the state and local levels.
 In 2012, during a change of leadership in the Colorado State Legislature, Brown supported a pro-gun Senator to take the place of one he felt was not supportive of Second Amendment rights.
The state senator whose loyalty to the Second Amendment was called into question called Brown "the most dangerous man in Republican politics."

At the Colorado GOP convention in April 2012, RMGO and Brown supported pro-gun candidates and spoke out against those whom they considered anything less.
The impact of Brown and RMGO on the 2012 election in Colorado was that nine out of eleven of their endorsed candidates won the general election.

In opposition to the Colorado Legislature's gun control legislation in 2013, Brown mobilized thousands of supporters at the capitol building in Denver and also testified before the Senate Judiciary Committee.

In 2013, Brown and 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 recall was cancelled when Senator Hudak resigned and was replaced by another Democratic Senator, Rachel Zenzinger.
Senator Zenzinger lost her re-election bid in the midterm elections of 2014 to the RMGO endorsed Republican candidate, Laura Woods.

In October 2014, Brown and RMGO launched a lawsuit against the Colorado Secretary of State to keep RMGO donor information private.

During the 2014 midterm elections, three of RMGO's candidates won legislative seats, helping Republicans take control of the Colorado State Senate, which Democrats had controlled for ten years.

In 2015, the Colorado State Legislature considered legislation that would bump the magazine limit enacted in 2013 from 15 rounds to 30 rounds.
Brown opposed the legislation, arguing that 30 rounds per magazine isn't enough.
Brown's opposition to the increased magazine limit drew criticism from fellow gun rights activists.
Luc Hatlestad of 5280 magazine wrote that conservatives were questioning whether Brown "is more committed to the money his activism earns him than the alleged principles behind his supposedly high-minded crusade."

Rocky Mountain Gun Owners sued the state of Colorado over the 2013 ban on gun magazines arguing that it violates the constitution.
On November 13, 2019 the Colorado Supreme Court heard oral arguments in the case. "
For 138 years, the General Assembly never banned a single firearm or firearm component, HB-1224 is a departure from a 138-year tradition," said Barry Arrington, the attorney representing Rocky Mountain Gun Owners.

Rocky Mountain Gun Owners opposes Colorado's "Red Flag" gun confiscation law, HB 1177, which went into effect January 1, 2020.
The law was abused almost as soon as it was enacted when a petition was filed against Colorado State University Police officer Phillip Morris on January 9, 2020.
The petitioner Susan Holmes, claimed that she shared her child Jeremy Holmes, with the officer who shot him in self defense on July 1, 2017.

"Dudley Brown, the director of gun-rights organization Rocky Mountain Gun Owners, attended the hearing and said it proves that the law will be used to r
Brown founded the Colorado organization Rocky Mountain Gun Owners in 1996 as a "no-compromise" alternative to other pro-gun organizations. In the wake of the Columbine High School massacre, Colorado voters passed Amendment 22, a voter-initiated measure requiring background checks of gun purchases at gun shows, closing the gun show loophole. Brown opposed the initiative, stating, "We're under assault right now. We feel like the Jews did in Nazi Germany."
 In 2002, a complaint was filed against Brown with the Colorado Secretary of State, alleging that a fund-raising letter he wrote supporting the congressional campaign of Marilyn Musgrave violated state law.  The complaint claimed that, "As a registered lobbyist, Mr. Brown is clearly prohibited from fund-raising while the General Assembly is in session." Brown called the complaint "frivolous".
Brown is known for involving his organization in Republican Party (GOP) primary elections at the state and local levels.  In 2012, during a change of leadership in the Colorado State Legislature, Brown supported a pro-gun Senator to take the place of one he felt was not supportive of Second Amendment rights. The state senator whose loyalty to the Second Amendment was called into question called Brown "the most dangerous man in Republican politics."
At the Colorado GOP convention in April 2012, RMGO and Brown supported pro-gun candidates and spoke out against those whom they considered anything less. The impact of Brown and RMGO on the 2012 election in Colorado was that nine out of eleven of their endorsed candidates won the general election.
In opposition to the Colorado Legislature's gun control legislation in 2013, Brown mobilized thousands of supporters at the capitol building in Denver and also testified before the Senate Judiciary Committee.
In 2013, Brown and 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 recall was cancelled when Senator Hudak resigned and was replaced by another Democratic Senator, Rachel Zenzinger. Senator Zenzinger lost her re-election bid in the midterm elections of 2014 to the RMGO endorsed Republican candidate, Laura Woods.
In October 2014, Brown and RMGO launched a lawsuit against the Colorado Secretary of State to keep RMGO donor information private.
During the 2014 midterm elections, three of RMGO's candidates won legislative seats, helping Republicans take control of the Colorado State Senate, which Democrats had controlled for ten years.
In 2015, the Colorado State Legislature considered legislation that would bump the magazine limit enacted in 2013 from 15 rounds to 30 rounds. Brown opposed the legislation, arguing that 30 rounds per magazine isn't enough. Brown's opposition to the increased magazine limit drew criticism from fellow gun rights activists. Luc Hatlestad of 5280 magazine wrote that conservatives were questioning whether Brown "is more committed to the money his activism earns him than the alleged principles behind his supposedly high-minded crusade."
Rocky Mountain Gun Owners sued the state of Colorado over the 2013 ban on gun magazines arguing that it violates the constitution. On November 13, 2019 the Colorado Supreme Court heard oral arguments in the case. "For 138 years, the General Assembly never banned a single firearm or firearm component, HB-1224 is a departure from a 138-year tradition," said Barry Arrington, the attorney representing Rocky Mountain Gun Owners.
Rocky Mountain Gun Owners opposes Colorado's "Red Flag" gun confiscation law, HB 1177, which went into effect January 1, 2020. The law was abused almost as soon as it was enacted when a petition was filed against Colorado State University Police officer Phillip Morris on January 9, 2020. The petitioner Susan Holmes, claimed that she shared her child Jeremy Holmes, with the officer who shot him in self defense on July 1, 2017.
"Dudley Brown, the director of gun-rights organization Rocky Mountain Gun Owners, attended the hearing and said it proves that the law will be used to r
Dudley Brown