No one talked about the KJW ehh ! Not a lot of upgrades available, for the simple reason it doesn't need any. People complained about the Canadian looking magazine (Thermold) but there is a stanag version now available. Just throw a velocity reducer from Cradle and it's good to go, I've beaten mine and beaten again and it still works awesome !! Some mags need some work now, after 3-4 years of abuse and no propper lube and care