I agree with salty dog, the AR is a much more refined design, easier to field strip and clean/reassemble, parts are pretty easy to find if something breaks, and are chambered in a flatter shooting, more inherently accurate cartridge.
as I stated in my first post I had an AK for 3 years before I finally got fed up with it and sold it and my brother soon followed suit. both of us still own a pair of AR15s each. unless you go with a specialty caliber it's pretty easy to find an AR for cheaper than an AK as well.
you also have a very large number of calibers open to you in AR15s while AKs are pretty much just in 7.62x39, 5.45x39 and 223(some 12 gauge and 308 exceptions but that's about it).
I own an AR15 in 5.56 Nato and one in 9mm Nato. the brother owns one in 5.56 and one in 7.62x39(same as the AK). other common and popular calibers are
22 long rifle
5.7x28 FN Herstal(the same as the PS90 sub machinegun)
300 fireball(lots of 300s)
7.62x40(I think also known as 30 wilson)
and a lot of others that I can't think of off the top of my head.
all guns lost in a tragic smelting accident.
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