Rep. Paul Broun (R-Ga.) took a shot Friday at Rep. Phil Gingrey (R-Ga.), a likely Senate primary opponent, for Gingrey's openness to new gun regulations.

"The Senate needs more strong, pro-gun conservatives who will stand up for the rights of Americans, no matter how lonely a fight — as you can see ... I'm that type of man," Broun wrote in a fundraising email to supporters. 

"Unfortunately, not all Republicans feel the same way. In fact, according to his hometown newspaper, one of my strongest potential primary opponents just recently said he 'would be open to some measures restricting high-capacity magazines and enforcing more rigorous requirements for background checks at gun shows.' "

That's a reference to Gingrey, who sources say has told Georgia Republicans he's running for the Senate.

The email begins with Broun promising an "ugly fight" in Congress over gun control, warning that "every week the politicians in Washington launch another attack on our constitutional rights."

Broun is no stranger to fiery statements — he's said President Obama is a socialist on numerous occasions — but this is the first direct attack he's made on a potential primary opponent since the campaign started.