(CNN) - As gun legislation talks between Sen. Joe Manchin, D-West Virginia, and Sen. Tom Coburn, R-Oklahoma, stretch on with no compromise over a provision that would include background checks for all gun purchases, Manchin has begun talks with another conservative Republican, Sen. Pat Toomey (Pennsylvania), sources familiar with the talks confirm to CNN.
A Senate Democratic leadership aide says they "feel positive" about the prospects of brokering a deal that would include a background check provision, but "it's not done and could still fall apart."
If a deal is reached, Senate Majority Leader Harry Reid will move quickly to include new language in the bill, the aide said.
An aide to Toomey said the senator is talking to colleagues on both sides of the aisle. However, the aide also cautioned they may not be as close to a deal as Democratic aides are suggesting.
An aide to Coburn insists that he is still involved in the process. When asked if Toomey's involvement means Coburn is out, the aide said, "Not at all. He's still hopeful they can reach an agreement."