1) Mauser 98k - Extremely rugged bolt-action rifle, highly effective as many of our ancestors have found out on their own skins. The action of that rifle is used in many hunting, target and even sniper rifles. You have to wrestle it to cycle it (not buttery-smooth like Lee Enfield) but you can use your rifle bolt as a club to bust grizzly heads and put it back into the rifle and cycle rounds with it as soon as you get some hands on some ammo.
2) AK-47 and variants - Designed on the concept that true beauty lies in maximizing the functionality, Mikhail Timofeyevich Kalashnikov designed this rifle for the defense of his homeland. Extremely rugged, reasonably accurate at battle distances, easy to use and maintain, it has been the weapon of choice of Combloc governments like the SSSR, Yugoslavia, Romania, various African warlords and their child soldiers, NATO-friendly governments like Peru and Israel and many others. While many exist in its original state and are still used to great effect, the platform has evolved to a smaller, flatter-flying cartridge and availability of rails to mount modern sights. Israel and Serbia even adapted it to fire 5.56NATO, with their Galil and Zastava M21 rifles. The semi-automatic sproting version has a HUGE accessories aftermarket. I'd love to do some sport shooting with one, but unfortunately, they are prohibited by name in Canada to the point of confiscating air rifles built with some AK parts
3) Colt 1911 - Iconic handgun, used to great effect to enslave the Philippines, free Europe from enslavement and try to enslave Vietnam. Still used by modern militaries and police services, plus it's very popular in the sporting market due to the caliber, reliability and insanely large aftermarket. Carried for self-defensive use too, but I wouldn't wanna lug something that big.
4) M16 and its variants like the currently used M4 military rifle, and the sporting use semi-automatic Armalite Rifle model 15 (AR-15) - Having designed shortly after the AK-47, the platform received many improvements over its lifetime, inspired by battle-testing at the beginning and continuing with sporting use. Selective fire (automatic) rifles are used by most of the "free" world militaries and many police services, while the sporting semi-automatic versions (AR-15 variants) are used by sport shooters, police services and hunters (but not in Canada because one cannot hunt with it due to its legal classification). This rifle has the biggest aftermarket of them all and is referred to as "Barbie doll for men". Highly modular system where you can swap uppers (with different optics and even calibers) in under 10 seconds should your mission or game requirements change.
5) Glock pistol - A complete outsider to the industry Gaston Glock was determined to prove that tupperware can shoot. He proved it quite nicely, by designing a top-notch polymer (plastic) frame pistol that's well-loved by militaries, police services, defensive carry users (in countries that respect a human's right to protect himself/his loved ones) and even sport shooters (even though the sport shooting community prefers heavier guns that absorb recoil better but you wouldn't wanna carry one on your hip all day every day). In the process, he came up with a gun that saves about 33% of the weight compared to conventional metal-framed guns and is one of the (if not "the") most reliable handguns on the market.