Actually some countries with the highest suicide rates have decent gun control. Japan isn’t in the top 10, and South Korea is the Asian country with high suicide rates and has strong gun control. Here are the 2024 countries with the most suicides per 100k, and the USA/Japan for reference.
Here are the estimated guns owned per hundred residents
Lesotho 4.8
Guyana 15.8
Eswatini 4.8
South Korea 0.2
Kiribati 0.8
Micronesia 0.7
Lithuania 13.6
Suriname 15.9
Russia 12.3
South Africa 9.7
USA 120.5
Japan 0.3
I would need to graph this data for every country and year over year to see if there is a correlation. It would be hard to extrapolate especially considering so many different cultural beliefs on suicide and gun control/ownership.
US surgeon general declares gun violence a public health crisis (apnews.com)