According to that report, there has been a massive increase in firearms ownership and a significant increase in firearms manufacturing.

The report, titled "Firearms Commerce in the United States – Annual Statistical Update 2021," sheds light on the number of firearms manufactured per year, firearms imports & exports, NFA forms filed, and more.

According to the report, firearms manufacturing has tripled since the year 2000. It continues to increase over time, with manufacturing reaching a high of 11,497,441 firearms made in 2016, likely due to the demand caused by the 2016 election (there is no data for 2020 or 2021 in the report).

Clearly, Americans' appetite for firearms has increased dramatically over the years, with demand being met by a huge rise in imports...

Handguns dominated the imports...

Additionally, based on background check data, one would expect that the numbers for 2020 & 2021 would be significantly higher than previous years as well...

This fits with the fact that many Americans who have traditionally opposed firearms-ownership bought guns in the face of civil unrest and the COVID-19 pandemic during those years.

Interestingly, the amount of tax revenue stemming from the National Firearms Act is also included in the report. The NFA, as it is commonly known, is a 1934 law that regulates and taxes the purchase of machine guns, short-barreled rifles, and silencers.

ATF reports that since 2000 the revenue from NFA tax has increased from around $2 Million to $51.6 Million in 2020, including a 635% increase in Form 4 applications alone. (The ATF Form 4 is used to transfer a suppressor, machine gun, or SBR from a dealer to an individual.)