“The bill bans any federal gun registry and carries a 15 year prison term for anyone who violates it," he continues. “We protect and expand a good number of pro-gun rights measures as well.

Gottleib goes on to brag that the legislation contains "advances for our cause" including new exceptions for the interstate sale of handguns, travel with firearms, and civil and criminal immunities for gun sellers. 

“These advances for gun rights cannot be made unless we win the Senate vote on Tuesday to substitute it for the current Schumer draconian background check that is in the bill at this time,” Gottleib says, adding it would be "fun to see Obama forced to sign it."

Despite Gottlieb's excitement, the nation's largest gun-rights group — the National Rifle Association — has said it opposes the Toomey-Manchin amendment.

In a letter to senators from NRA chief lobbyist Chris Cox last week, the NRA said it was "unequivocally opposed" to the Senate bill.

"In addition, the NRA will oppose any amendments offered to S. 649 that restrict fundamental Second Amendment freedoms; including, but not limited to, proposals that would ban commonly and lawfully owned firearms and magazines or criminalize the private transfer of firearms through an expansion of background checks," Cox writes. "This includes the misguided 'compromise' proposal drafted by Senators Joe ManchinJoseph (Joe) ManchinMcConnell hits back at 'ridiculous' Chinaperson remark Overnight Defense: New allegations against VA nominee | Pompeo vote set for Thursday | Work begins on defense policy bill | Measures push space corps, pay bump for troops Pompeo set to be confirmed on Thursday MORE, Pat Toomey and Chuck SchumerCharles (Chuck) Ellis SchumerCan Mueller be more honest than his colleagues? Throwing some cold water on all of the Korean summit optimism House Republicans push Mulvaney, Trump to rescind Gateway funds MORE."

The NRA added that it will grade senators not only on how they vote for the Toomey-Manchin amendment but also on their votes for the final cloture motion, a break with the group's usual policy of not judging procedural votes.