If you're looking for internal reliability, the TM AK is the best choice so is all other Version 3 gearboxes. As for the M4's well if you're into modding it's a good choice but the TM one has that "barrel wobble" that you could fix by putting a metal body which the ICS version already has. TM M4's are kinda fragile because of the plastic tabs and such but you could put a metal body on it and it will be fine. Bottom line it's all about looks, I'd take the TM AK over any stock M4 but if you get it full metal then it gets down only to looks. That's just my opinion, do what ever you like with it.
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