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I just got an ECHO1 EBR (which is a rebranded KART from what I have read) and yes you can drop a TM mechbox/upper/barrel assembly straight into the chassis. The only issue might be the wiring since the EBR requires the wiring to go forward and the standard M14 requires it to go back. M14's are externally wired regardless so you wont have to open the mechbox but you might need to make an adapter to lengthen the wires off the mechbox enough to bring them forward.
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