"There are problems with that, just practical, mechanical problems," he said. "When you see the Senate refuse to concur, do not assume it's just the gun amendment."
Senate President Jeff Kessler, D-Marshall, said he asked Snyder and his staff to look over the bill and provide recommendations to the rest of the body. He said expanding the program to all state cities likely would not work.
"It might be more than we can chew at this point," he said. "If it opens up to everybody known to man, they might have more than 200 applications filed and not enough staff to handle them all."
The pilot program allowed certain cities to make decisions and rules, such as those related to taxes, that might otherwise conflict with state laws. The pilot project is set to expire June 30, but the bill currently before the Legislature would extend it to July 1, 2019.
Lane's amendment gives cities currently in the program or looking to join an ultimatum: do away with existing gun ordinances, or opt out of home rule.
While the state already has a law on the books forbidding cities from establishing new gun rules, some municipalities' gun ordinances were grandfathered in.
A bill to abolish those rules -- including a 20-year-old Charleston ordinance limiting handgun sales to one per customer per month with a 72 hour waiting period -- received overwhelming support in the House but died in the Senate.
Kessler declared the legislation would not pass after Snyder and Senate Judiciary Chairman Corey Palumbo, D-Kanawha, began receiving threats over the bill.
A conference committee must make a decision before Midnight Sunday, as Saturday is the last full day of the legislative session.
Writer Dave Boucher contributed to this report.