The nation's largest sporting goods retailer announced the move in an open letter and an appearance by CEO Ed Stack on Good Morning America.
The retailer will also end sales of high-capacity magazines and sales of guns to people under 21 years old.
Assault-style weapon sales ended at Dick's-branded stores after the Newtown, Conn. school shooting in 2012. But the company was still selling them at its 35 Field & Stream locations, which specialize in hunting and outdoors products.
More: Here's what Dick's Sporting Goods CEO Ed Stack wrote about his company's actions
"As we looked at what happened down in Parkland, we were so disturbed and saddened by what happened, we felt we really needed to do something," Stack told GMA's George Stephanopoulos.
Stack acknowledged that the Parkland school shooter had purchased a shotgun at one of the company's stores in November. Though the killer did not use the gun in the shooting, the realization served as a catalyst for action.
Next Slide
"We did everything by the book, we did everything that the law required and still he was able to buy a gun," Stack said. "When we looked at that, we said, ‘The systems that are in place across the board just aren’t effective enough to keep us from selling someone a gun like that.’"
More: Not just bulletproof backpacks: Interest in products to keep shooters out is growing
More: NRA fallout: See the list of companies that cut discounts for NRA members after Parkland, Florida school shooting
More: Is sticking by the NRA a branding problem? Ask FedEx, Apple and Amazon
Although the decision drew praise from gun-control proponents, don't expect it to make a big impact on gun sales. Sales of guns and ammunition are "highly fragmented and characterized by a large number of small players," according to market-research firm IBISWorld.
The four largest gun sellers control only 5% of the market. The U.S. had about 6,550 gun shops as of November 2016. And although online sales have increased in popularity, federal regulations requiring local dealers to fulfill gun purchases have empowered mom-and-pop shops.
Stack described Dick's change as a direct response to the Parkland students who have pushed for change following the shooting. He said the company remains a "staunch" supporter of Second Amendment rights, adding that he owns a gun himself.
The move comes as businesses are coming under pressure to cut ties to the gun-rights lobby. Several major companies have cut discounts for members of the National Rifle Association, including Delta Air Lines, United Airlines, Enterprise, Avis Budget, Hertz, TrueCar, MetLife and Symantec.
Asked whether Dick's is prepared for a backlash, Stack said yes. 
"We know that this isn't going to make everyone happy but when we take a look at what those kids and the parents and the heroes in the school, what they did, our view was if the kids can be brave enough to organize like they this, we can be brave enough to take these out of here," Stack said.
The company also took the unusual step of calling for Congress to ban assault-style weapons, raise the minimum age to purchase a gun to 21 and outlaw sales of high-capacity magazines and bump stocks.
The retailer asked Congress to impose "universal background checks" and "ensure a complete universal database of those banned from buying firearms."
"We hope others join us in this effort to let our kids know that their pleas are being taken seriously," Stack said in his open letter.
One immediate question: Will Dick's competitors follow suit?
Walmart banned assault-style weapons in 2015. It was not immediately clear if the company still sells guns to people under 21 or if it sells high-capacity magazines. A spokesperson was not immediately available for comment.
Cabela's and Bass Pro Shops, which are now the same company, continue to sell assault-style weapons and high-capacity magazines.
Representatives of Cabela's and Bass Pro Shops were not immediately available for comment.
Dick's Sporting Goods investors did not appear to be concerned by the financial implications of the decision. The company's stock rose 0.6% shortly after the opening bell.
Follow USA TODAY reporter Nathan Bomey on Twitter @NathanBomey.
  • Democrats Urge for Gun Reform on Senate Floor
    Democrats Urge for Gun Reform on Senate Floor
  • Donald Trump: Don't include concealed weapons in background check bill
    Donald Trump: Don't include concealed weapons in background check bill
  • Trump says Congress is 'afraid of the NRA'
    Trump says Congress is 'afraid of the NRA'
  • Fla. Gov. Rick Scott unveils $500M school safety plan
    Fla. Gov. Rick Scott unveils $500M school safety plan
  • Dick's Ends Sales Of Assault-Style Rifles
    Dick's Ends Sales Of Assault-Style Rifles
  • Congress debate on gun control stalls vote
    Congress debate on gun control stalls vote
  • Some GOP lawmakers open to gun law changes
    Some GOP lawmakers open to gun law changes
  • Expert: Dollars driving NRA corporate backlash
    Expert: Dollars driving NRA corporate backlash
  • Georgia conservatives give Delta ultimatum on NRA dealings
    Georgia conservatives give Delta ultimatum on NRA dealings
  • White House: Some teachers 'desire' being armed
    White House: Some teachers 'desire' being armed
  • Lawrence: 'problem is guns, not entertainment'
    Lawrence: 'problem is guns, not entertainment'
  • Gun owners destroy weapons in protest
    Gun owners destroy weapons in protest
  • Eric Trump supports raising gun purchasing age to 21
    Eric Trump supports raising gun purchasing age to 21
  • Trump looking at law allowing gun confiscation from dangerous owners
    Trump looking at law allowing gun confiscation from dangerous owners
  • GOP Rep. says background checks like 'trying to put lipstick on a pig'
    GOP Rep. says background checks like 'trying to put lipstick on a pig'
  • Colorado teacher: 'I don't want to have a gun'
    Colorado teacher: 'I don't want to have a gun'
  • FL governor proposes gun sale ban to anyone under 21
    FL governor proposes gun sale ban to anyone under 21
  • Teacher won't carry a gun in class 'ever, ever, ever'
    Teacher won't carry a gun in class 'ever, ever, ever'
  • Florida school supt. against arming teachers
    Florida school supt. against arming teachers
  • Florida governor proposes plan to prevent gun violence
    Florida governor proposes plan to prevent gun violence
  • Bank and car rental giants are cutting ties with the NRA
    Bank and car rental giants are cutting ties with the NRA
  • White House: Arming teachers 'very serious' idea
    White House: Arming teachers 'very serious' idea
  • President Trump suggests giving teachers bonuses for carrying guns
    President Trump suggests giving teachers bonuses for carrying guns
  • White House: President opposes 'brand' of shooter drills
    White House: President opposes 'brand' of shooter drills
  • Armed police guard schools in N.J. after Florida shooting
    Armed police guard schools in N.J. after Florida shooting
  • 'You're wrong!' Florida Sheriff tells NRA spokeswoman
    'You're wrong!' Florida Sheriff tells NRA spokeswoman
  • Florida sheriff program arms trained teachers
    Florida sheriff program arms trained teachers
  • Mich. Teacher: Arming Us 'Absolutely Ridiculous'
    Mich. Teacher: Arming Us 'Absolutely Ridiculous'
  • Trump pledges to raise minimum age for gun purchases to 21
    Trump pledges to raise minimum age for gun purchases to 21
  • Donald Trump backs hardened schools, not shooter drills
    Donald Trump backs hardened schools, not shooter drills
  • NRA: 'Many in legacy media love mass shootings'
    NRA: 'Many in legacy media love mass shootings'
  • Union: No to arming teachers
    Union: No to arming teachers
  • Mike Pence: School safety will be 'top national priority'
    Mike Pence: School safety will be 'top national priority'
  • NRA: We must 'harden' protections at our vulnerable schools
    NRA: We must 'harden' protections at our vulnerable schools
  • School shooting survivors confront President Trump
    School shooting survivors confront President Trump
  • Voices: How gun control advocates are creating change
    Voices: How gun control advocates are creating change
  • Students get emotional in talks with Trump
    Students get emotional in talks with Trump
  • Trump considers concealed carry for teachers
    Trump considers concealed carry for teachers
  • GOP congresswoman claims many Mass Murderers 'end up being Democrats'
    GOP congresswoman claims many Mass Murderers 'end up being Democrats'
  • Toomey eyes reviving gun background check bill
    Toomey eyes reviving gun background check bill
  • Sheriff, NRA spokeswoman clash at CNN town hall
    Sheriff, NRA spokeswoman clash at CNN town hall
  • Angry questions at CNN town hall on guns
    Angry questions at CNN town hall on guns
  • Students across the U.S. hold protest walkouts over gun violence
    Students across the U.S. hold protest walkouts over gun violence
  • Store that sold gun to Florida shooter closes its doors
    Store that sold gun to Florida shooter closes its doors
  • Douglas Students Petition Florida Lawmakers
    Douglas Students Petition Florida Lawmakers
  • Passionate pleas for tougher gun laws in Florida
    Passionate pleas for tougher gun laws in Florida
  • Florida Sen. Bill Nelson urges change in gun laws
    Florida Sen. Bill Nelson urges change in gun laws
  • Maryland students head to Capitol in call for gun control
    Maryland students head to Capitol in call for gun control
  • Fla. House declares porn public health risk, denies assault rifle ban
    Fla. House declares porn public health risk, denies assault rifle ban
  • President Trump on move to ban bump stocks
    President Trump on move to ban bump stocks
  • AP Explains: Fla. Lawmakers Focus on Gun Debate
    AP Explains: Fla. Lawmakers Focus on Gun Debate
  • NJ Gov. Phil Murphy eyes regional approach on guns
    NJ Gov. Phil Murphy eyes regional approach on guns
  • Trump proposes ban of rapid-fire gun devices
    Trump proposes ban of rapid-fire gun devices
  • Florida students rally to change gun laws
    Florida students rally to change gun laws
  • Jimmy Kimmel makes tearful plea to Donald Trump for gun control
    Jimmy Kimmel makes tearful plea to Donald Trump for gun control
  • Column: Get the numbers right on school shootings
    Column: Get the numbers right on school shootings
  • Florida Shooting Survivors Protest NRA
    Florida Shooting Survivors Protest NRA
  • Fla. Senator demands action after mass shooting
    Fla. Senator demands action after mass shooting
  • Florida students protest against gun violence
    Florida students protest against gun violence
  • Fla. Gov. Rick Scott vows to keep mentally ill from guns
    Fla. Gov. Rick Scott vows to keep mentally ill from guns
  • Why AR-15-style rifles are so common in mass shootings
    Why AR-15-style rifles are so common in mass shootings
  • Florida school shooting fuels calls for #GunReformNow
    Florida school shooting fuels calls for #GunReformNow

LINKEDIN 269COMMENTMORE