A pro-gun group is fighting the Obama administration's plan to ban armor-piercing bullets and has launched a television ad as part of that effort.The advertising campaign is being launched by the Second Amendment Foundation and will air on conservative-leaning cable news channels, such as the Fox News Channel and The Blaze TV, CNN is reporting. "Attention: President Obama is exercising another executive power grab," the ad opens."And this time he is going after your Second Amendment rights to keep and bear arms." According to SAF, the television ad is part of an advertising campaign intended to hit both television and radio.The ad calls on viewers to call a toll-free number so that they can "send their message to Obama, and support the SAF media campaign.""There are less than two years remaining in Barack Obama’s presidency," said SAF founded and executive vice president Alan Gottlieb."He’s scrambling to create a legacy, and a big part of that effort is to establish himself as the man who brought restrictive gun control to America," he explained. "He has weakened our military, eroded our diplomatic credibility and now he’s scrambling to destroy the Second Amendment. We’re giving Americans the voice to stop him."The Bureau of Alcohol, Tobacco, Firearms and Explosives recently announced that it is proposing a ban on certain types of 5.56mm rounds, or .223 caliber, which is a type of ammunition used used in AR-15 rifles. Specifically, only "M855 green tip" or "SS109" rounds that contain particular metal cores would be affected.The rule would prevent ammunition makers from making these types of rifle ammo, but would allow those who already own such ammo to continue to legally own it.The proposal has been criticized as a backdoor way for the Obama administration to implement gun control without legislation."The Obama administration was unable to impose gun restrictions and confiscation through the legislative process, so now it's trying to ban commonly used ammunition through regulation," the SAF ad says."Obama must be stopped now!"Video: