...unless the person who carried it was to lazy to clean it at the proper time.
The battle rifle used is going to be what the Sargent says to use for war, if part of a regular Military. My basic assumptions are a militia unit under conditions of social break down.
What's "the proper time" for cleaning? Doesn't that assume you will have a secure area to sit in while you have disabled your rifle in order to clean it? That's where my unease comes from. Oh, it's great if your unit has the discipline to work together instead of being a pack of macho, wannabe wolves, and they take turn about cleaning, sleeping, and standing guard. I'd much rather be the FNG with veterans than the veteran saddled with a wolf pack.
Also, the ammo depends on either a large stash or supply from "On High". From what I hear of the Army, they need to have ammo moved to the front lines by the forklift load because of the unaimed suppressive fire doctrine. (The Marines, being somewhat smarter, if not quite smart enough for the Navy, actually aim and run through less ammo.) Fight the way you train, and the Army trains to be wasteful. Not good in times of social breakdown.
Reloading? I don't know if Herco will work in .223, but it darn sure won't work in a direct impingement gas action. How many other reloading powders are as dirty?
I have an AR, semi AK, and an SKS. The AK and SKS have fewer places powder residue can build up, and the parts involved are larger (easier to find if they are dropped). I'd want to change the two Russian rifles so the gas tubes were easier and faster to pull and clean, if I was redesigning them, or if a mod came out.
The usual AK found in the battlefield, if mine is any example, is simply not made to the standards of any other fighting rifle. It's a self loading zip gun. I've heard that some US made semi auto AK's are pretty darn good (and expensive, comparable in price to an M1A), so I figure comparisons of the two designs should be between equal quality samples, if we're talking /design/. If we are talking "what's available", well, there's a point.
Now, from what I hear, there's a few AR design rifles and some M1A imports that are poorly made. So just the design alone is not enough.