IOWA CITY, Iowa (AP) — The campaign for tighter gun laws that inspired unprecedented student walkouts across the country still faces an uphill climb in a majority of states, an Associated Press review of gun legislation found.

The AP survey of bill activity in state legislatures before and after the Parkland, Florida, school shooting provides a reality check on the ambitions of the “Enough is Enough” movement. It suggests that votes like the one in Florida, where Republican lawmakers defied the National Rifle Association to pass new gun regulations, are unlikely to be repeated in many other states, at least not this year.

The student-led activism might yet lead to future reforms, but for now, the gun debate among most lawmakers still falls along predictable and largely partisan lines, with few exceptions, according to the analysis.

Because Congress shows no sign of acting, state legislatures dominate the national debate over guns. And major changes won’t be easy to achieve in statehouses that are mostly controlled by the gun-friendly GOP. Republicans have sponsored more than 80 percent of bills that would expand gun rights, while Democrats have introduced more than 90 percent of bills to limit them. The total number of gun-rights and gun-control bills identified by AP statehouse reporters is roughly equal — about 300 in each category.

Many of the Democratic gun-control bills have been introduced in legislatures dominated by Republicans, meaning they have little or no chance of passing. “I think (the) public attitude has changed, but I don’t see a big change here in the Legislature,” said Iowa Rep. Art Staed, a Democrat who sought unsuccessfully after the Parkland attack to force the Iowa House to consider allowing courts to temporarily seize guns from dangerous individuals. “It’s been very frustrating.”

Iowa’s GOP-controlled Legislature, which last year approved a historic expansion of gun rights, has not held hearings on Democratic proposals to ban assault-style weapons, prohibit high-capacity magazines or expand background checks. Instead, lawmakers have considered more pro-gun initiatives, including a bill to allow residents to carry handguns without obtaining permits and a resolution to enshrine the right to bear arms in the Iowa Constitution.

Iowa Gun Owners, a “no-compromise gun lobby,” has mobilized its members to pressure Republican lawmakers to hold firm.