[lurkingknight]

resale means very little these days, especially in the 200-300$ range. It's so little money between what you'd want for it vs what someone is going to be willing to pay for a used gun... for a few sheets more you could be walking into a new gun.

The only thing that might help you is if the gun is full metal with a relatively strong gearbox shell. the CMs have a shit gearbox shell. It's unreinforced and it's thin. It's a very old clone. The KA has a reinforced shell based off of newer designs.

As the CM gets used and gets older that shell has a greater chance of cracking at the front without additional upgrades from a good gun tech. The KA will be a lot more resistant to that as long as you're not playing in the dead of winter whereas G&G gearboxes will crack with a 110 spring in early spring or late fall temps.

If that's really the full metal KA m4, buy it with confidence, it's a far better choice over the CM. Even if it ISN'T the full metal one, G&G is just abs plastic body while the KA is nylon fiber. It's still a better choice and still should have the better gearbox shell.