For what it’s worth, and mind you I don’t crawl through mud with my rifles, but I had an SAR-1 and SAR-2, (Century arms knockoffs of semi-auto AK47 and AK74). Reliable yes. Great magazines, yes. Not accurate. And they did jam. More than just a couple times, and weird, but more so than I have had with my newest gun, an M-4 style AR-15 which has never jammed, and I shoot that cheap Bear ammo through it.
I really like that new Bushmaster ACR, which is the Masada that Magpul designed. (I don’t have one though) Beautiful, ergonomic, and suppose to fix all the problems with the M-4.
The ACR isn’t an AR. It’s a cross between an AR-18 and an FN-SCAR.