Re: "68 mass shottings since 1982" or "I don't like Mondays" revisited.
Don't know where you got that figure for Israels gun ownership...
Soldiers (18-21) will indeed generally have a rifle, stored in a suitable cabinet at home (whilst at home, during the week they are on base). But not every house owns an 18-21 year old. And not all of them have rifles, most the girls do not, and a lot of soldiers are not combat soldiers, and thus carry no weapon.
Outside of the forces, gun regulation is very very strict in Israel, and without a valid reason (generally employment, needs to be security) you cannot get one.
Switzerland is perhaps where you were thinking, and their rules have changed in the last 5 years, they did have a very large gun death rate prior to these changes (keeping ammo for a town in one/two locations, instead of at home).