Private makers, private figures.

American gun manufacturers produce millions of firearms annually — nearly 9.4 million in 2015, according to the Bureau of Alcohol, Tobacco, Firearms and Explosives. Nearly 3.7 million of those were rifles, including AR-15-style semiautomatic rifles like those used in several mass shootings.

Only a few of the thousands of licensed firearms manufacturers in the country are publicly owned and must disclose sales figures to investors. Those include American Outdoor Brands Corporation, formerly known as Smith & Wesson Holding Corporation, which has reported declines in firearms sales for the past four quarters but generally does not report specific volumes. On Thursday, the company said that revenue from its firearms segment for the third quarter slumped 40.6 percent from last year to $117.6 million, compared with a 13.4 percent upswing in its outdoor products division.

Sturm Ruger, another public company, cut its production levels by 24 percent last year and also laid off 28 percent of its employees, according to Wedbush analysts. Other investor-owned businesses include Vista Outdoor and Olin, which both make ammunition.

A slew of smaller, single-product manufacturers emerged during the Obama administration, experts said. Most make semiautomatic firearms like the AR-15 known by some as assault weapons and by others as modern sport rifles. Few, if any, are eager to share performance metrics with the public.

Data diminishes at each step.

And few gun dealers publicly disclose how many guns they sell. The N.R.A. did not respond to requests for information about sales.

Analysts estimate that fewer than a quarter of firearms sales to consumers come from big-box retailers like Walmart and the outdoor and hunting outfitter Cabela’s. At Dick’s Sporting Goods, revenue from hunting products, including rifles, constitute 10 percent or less of annual sales, according to another Wedbush report.

Although Dick’s stores can be found nationwide, it sold assault-style rifles only at its 35 Field & Stream stores and on its websites. Walmart, which had already instituted similar restrictions in 2015, sells firearms at about half of its nearly 4,000 supercenter locations nationwide.