It might not exactly be the shootout at the OK Corral, but C. Scott Shields has the city of Philadelphia in his crosshairs again.

Yesterday, Mayor Michael Nutter announced the city would move ahead with enforcement of a new ordinance targeting those those who fail to report a lost or stolen handgun. Those who fail to do so are looking at a fairly stiff fine, a cool $1,900. But not if Shields get his way.

This comes despite the recent ruling from the U.S. Supreme Court that recognized the right of citizens to own a gun for their personal use.

Nutter is interpreting that ruling as leaving some “wiggle room” for cities to impose some restrictions on gun ownership, even while the high court was knocking down the District of Columbia’s 32-year-old handgun ban.

Obviously Shields, a Delaware County lawyer who’s no stranger to taking controversial stands, sees it a bit differently. Shields represents the National Rifle Association.

They take a fairly dim view of the recent move by Nutter and the Philadelphia City Council to enact a series of gun restrictions. They immediately went to court and got several of them put on ice.

Shields vows he will be back in court to seek a temporary injunction to block the new provision on reporting. It’s the NRA’s position that council has no authority to implement such laws, that gun matters are the sole province of the state Legislature.

“If we don’t get a stay ... the city will be faced with a civil rights suit,” Shields said.

“If you lose your piece, call the police,” was the word yesterday from Mayor Nutter.

Maybe they should stand back to back, take 10 paces, and then let the subpoenas fly.

One thing you can count on, this one will wind up in court.