Judging by your reaction to my explanation of Russian gun laws, I'd say you call those "common sense," so what does the following data tell you?

From 1990 until 2022, the "intentional homicide rate" (which is different from "murder rate" for strictly legalistic reasons) in Russia spiked from 14 to 33 per 100,000 people in 1994, then dipped down to 23 in 1998 before going back up and spiking again at 31 in 2002, and it has declined every single year since then. According to the Russian government (NOT a reliable source of information), the murder rate in 2022 was 3.7 per 100,000 people. However, according to independent studies, it was 12 per 100,000 people back in 2014 (the most recent year I was able to get an independent study from), at a time when the Russian government reported only 8 per 100,000 people. In other words, despite Russia's gun restrictions and relatively low rate of firearm ownership (approximately 9%), the murder rate is either comparable to or roughly double that of the US. The only source of information in English that contradicts the trend and reports an increase in 2022 is a single article in The Moscow Times, which claimed that Kommersant reported 296 additional murder cases from 2021. That same article mentioned that this data conflicts with official reports from the MVD (Ministry of Internal Affairs). Feel free to read the report for yourself, but it's all in Russian.

The last time that the Russian government confiscated civilian-owned weapons en masse was in 1941, not to combat gun crime or put down a rebellion, but to supply the woefully under-equipped Red Army. In fact, to the best of my knowledge (and as before, @apnigrich can fact-check me), Russian gun laws, at least those with respect to what citizens are allowed to own, have remained virtually unchanged since 1924, the year that Iosif Stalin took over.

Granted, comparing data from only three countries isn't statistically significant, but the point is that I'm completely unconvinced that getting rid of guns would do anything for the US, even if people complied with a confiscation order (which is exactly what a mandatory buyback is). Curiously, when looking up this information, the same independent study reported that although the murder rate in Russia is more than double that of the US, the rate of rape is 17 times higher in the US than in Russia. I know that's not relevant, but I thought that was interesting.