Shockingly, McRINO and Grahamnesty not on the list.

The full list: Ted Cruz, Mike Lee, Rand Paul, Marco Rubio, Jerry Moran, Jim Inhofe, Richard Burr, Ron Johnson, Mike Enzi, Jim Risch, Mike Crapo, Dan Coats, Pat Roberts.

Via Politico:

Kentucky Sen. Rand Paul’s threat to filibuster any new gun restrictions is gathering steam, as a dozen of his Republican colleagues have now signed onto his plan.

The Kentucky Republican and Sens. Ted Cruz (R-Texas) and Mike Lee (R-Utah) first wrote to Senate Majority Leader Harry Reid late last month to warn him of their intention to try to tie up the Senate if, as planned, Reid moved forward with legislation that would expand background checks and attempt to crack down on interstate gun trafficking.

Reid is expected to bring a gun-control bill to the floor as early as next week, or perhaps the following week, and Paul is renewing his vow to try to block the measure. Paul’s follow-up letter, obtained by POLITICO, bears Monday’s date and is signed by 13 Republicans, including fellow potential 2016 presidential aspirant Marco Rubio (R-Fla.) — who signed on shortly after Paul’s first threat was issued — and National Republican Senatorial Committee Chairman Jerry Moran of Kansas. […]

In the letter due to be sent Monday, a carbon copy of the first missive, Paul and his expanded group of allies reiterate that they “intend to oppose any legislation that would infringe on the American people’s constitutional right to bear arms, or their ability to exercise this right without being subjected to government surveillance.”

In addition to Paul, Lee, Cruz, Rubio and Moran, the Republican who have signed the second letter are Jim Inhofe of Oklahoma, Richard Burr of North Carolina, Ron Johnson of Wisconsin, Mike Enzi of Wyoming, Jim Risch and Mike Crapo of Idaho, Dan Coats of Indiana and Pat Roberts of Kansas.

“We will oppose the motion to proceed on any legislation that will serve as a vehicle for any additional gun restrictions,” they write.