The gun lobby is back on offense under the new GOP-controlled Congress.



The National Rifle Association and other gun rights groups are teaming with majority Republicans in efforts to loosen firearm restrictions, block background check legislation, and have already forced the Obama administration to back down from a controversial ammunition regulations.



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The aggressive push follows years in which gun rights advocates have fought tooth and nail to beat back gun control legislation bills in the divided Congress, including a flurry of bills proposed following the 2012 Newtown, Conn. elementary school massacre."Make no mistake about it, the American people do not want more gun control and now we have a more pro-Second Amendment Congress,” NRA spokeswoman Jennifer Baker told The Hill.The NRA flexed its muscle this week, pressuring the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) to shelve a plan that would have prohibited certain types of armor-piercing bullets used in high-powered AR-15 rifles.The ATF proposed the bullet ban last month, but pulled it back Tuesday after being overwhelmed with nearly 90,000 public comments, the “vast majority” of which were negative, the agency said.The move angered congressional Democrats and gun control advocates, who responded with appeals urging the agency urging it to revive the proposal.

“The question remains, ‘Why would a civilian need to walk the streets with a handgun chambered with military-grade, armor-piercing ammunition?’” asked Jonathan Hutson, a spokesman for the Brady Campaign to Prevent Gun Violence.



The bullet ban was aimed at armor-piercing legislation that has traditionally been used in AR-15 hunting rifles, but can be used in handguns.



The ATF had argues these bullets are a danger to police because they can pierce body armor and are more easily concealed by criminals in handguns. The agency also pointed out there are no fewer than 168 other types of bullets that would still be allowed for use in AR-15 rifles.



"I want to make sure everyone understands that this was not — contrary to the blogosphere — an effort to completely ban that sort of cartridge,” Jones told lawmakers in a hearing this week.



Even so, the ATF announced Tuesday it would take a step back and regroup, but Republicans and gun rights groups plan to press forward with what they view as a pro-Second Amendment agenda.



"I think Congress has never been more pro-gun than it is now," said Larry Keane, general counsel at the National Shooting Sports Foundation.



The foundation is hoping to build on the recent momentum by pushing the Bipartisan Sportsmen's Act that would increase opportunities for hunters and fishermen on public lands.



The bill, championed by Sens. Lisa Murkowski Lisa Ann MurkowskiSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (R-Alaska) and Martin Heinrich Martin Trevor HeinrichSenate Democrats demand White House fire controversial head of public lands agency Senate Democrats seek removal of controversial public lands head after nomination withdrawal Five takeaways from final Senate Intel Russia report MORE (D-N.M.), was introduced earlier this month.



Gun rights supporters are also pushing legislation that would expand concealed carry laws around the country.



The Constitutional Concealed Carry Reciprocity Act reintroduced last month by Sen. John Cornyn John CornynBipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection Airline job cuts loom in battleground states MORE (R-Texas) would allow people with concealed carry permits in one state to bring their guns into other states.



The measure is a top priority for the NRA.



"It's time for Congress to pass national right-to-carry reciprocity for the entire United States," NRA chief Wayne LaPierre declared late last month at the Conservative Political Action Conference.



The bill’s backers believe they can secure enough Democratic votes in the Senate to overcome a filibuster and send the legislation to President Obama’s desk.



The president would almost certainly veto the bill. Still, such a feat would be a victory for the groups, who have been unable to move any significant legislation expanding gun rights through in the last six years.



Gun control groups say the Republican legislation poses a “significant danger” to society, because it would force states with strict gun laws to recognize the concealed carry permits given to people in states with weaker gun laws.

Meanwhile, proponents of tighter gun restrictions face an even tougher road ahead in their push for universal background checks for all commercial gun sales.

The Public Safety and Second Amendment Rights Protection Act introduced earlier this month by Rep. Mike Thompson (D-Calif.) would beef up requirements for firearm sales made online and at gun shows.



“This bill is anti-criminal, and will help keep spouses, kids and communities safe by preventing dangerous people from getting guns,” Thompson said.