ITT: post guns thar are very reliable and talk about them. Also, correct me if i am wrong about these. Use redtext to point it out so everyone can see how dumb OP is.
AKM/AK74 series rifles
G3/PTR-91 series rifles
FAL/SA-58 series rifles
These rifles are extremely reliable.
The AK is known for being able to use any type of ammo thrown in it and still function properly. Some AKs use proprietary parts, while others use commonly found parts which can sell for cheap. The issue is corrosive surplus ammo, and optics. Many AKs are minute-of-man at 100m, usually 3 MoA. They are on the small side for big guys (im 6'3", i cant use one easily), and weigh slightly more than an AR. They may not be accurate, but they work. Not really useful beyond 250m unless you know what youre doing. But at that range. You want a full power round. This cheap intermediate-cartridge firing rifle is nice, but prices have climbed over the years. Expect to pay 600$-800$ for a decent one. High end ones go for 1,600$, and probably arent worth it. 1,000$ is about what is paid for a good one.
The G3/PTR-91, though less known, is more reliable than the FAL series rifles, for the fact it has no gas port, and is less vulnerable to sand issues. Firing the .308/7.62 real fuckin NATO, it is more powerful than the AKM, because .308 > 7,62x39, and more accurate than both. The delayed roller blowback design allows for the bullet to leave the barrel before cycling the gun, getting maximum velocity. There are some issues with some rifles where the roller depths arent proper, but for the most part, this is fine, and can be fixed by replacig the rollers, or entire bolt carrier. G3 mags are 2$/per, and spare furniture is extremely cheap. The downsides are odd mag release (fixed by gunsmith for 60$), and the front non-reciprocating charging handle. This gun is large for me, so it should be huge for small people and those vertically challenged folks. Designed off of the CETME, which was designed by an escaped Nazi off of the STG-45 schematics, this gun is about as old as the AK design. These prices vary on model, from 800$-2,100$. The cheap ones shoot around 1-2MOA. expensive ones are real heavy, but go sub-MOA out of the box. Not really needed in a SHTF rifle.
FAL/SA-58, though the less accurate of the bunch, is very reliable, and looks nice. The sights are good, the piston system works wonders, the charging handle is on the receiver, and it fires the 7.62 real fuckin NATO round. Theyre decent rifles, but mags are less and less common. Another issue is there is the inch pattern, and metric pattern, which can fuck you if you dont pay attention. Aftermarket parts arent as cheap as the G3/PTR, but theyre nice. Not as nice though, because Magpul makes a PRS stock for the G3/PTR, so you can have sexy PSG-1 clone. FAL was used as a Rhodesian battle rifle. Never shot one, i hear theyre as (in)accurate as an AKM is (2-4 MOA). These run 1,000$-1,500$ Each now.