my CA36K was used and she hasn't failed me yet. I've fired about 3000 rounds through it (I'm a trigger happy whore with large capacity mini-batts) and the only feeding/jamming problem i had was when the battery finally started dying lol.
My only complaints are the handle scope (which shouldn't matter to you since you're getting a rail) being too tiny to use and the selector switch. make sure you tighten each side a lot and use loctite or equiv cuz you'll lose one of them one day.
i've handled the TM version of the G36C, felt a little too light in my hands, but maybe that's because I had the K's weight to judge off of, so i can't be sure. looked hella plasticky too. just go with CA, you won't regret it.
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