As to the original question, a lot of guns were buried at the years of the Civel War (1917-1921). There was even a slang phrase "To store in the Land Banc" in the 1920-s, meaning the gun that was buried and unearthed, often a very good gun and often in miserable condition. It wasn't exactly the communists these guns were hidden from, it was the general chaos and anarchy and crime the country reresented at the time.
Another, but smaller, wave of "burials" came about 1941. As the Nazi hordes swept through Russia, the government in some regions gave weird orders that the citizens had to surrender all bicycles, radios, and hunting guns in their possession, "for military needs and temporary storage". The government promised to give vevrything back after the war, but some people figured their stuff was safer buried.
