The CA crane stock buffer tube is shorter by about 2 cm than the buffer tube that's on the CA M15A4 carbine (did this mod myself). I don't think it would be a problem but if you don't get the model with the buffer tube, you'll have to also modify the gray err washer (dunno what it's called, the thing the buffer screw goes through) so wires can run under it. You'll also have to modify the metal plate between the metal body and buffer tube so wires can be routed through it.
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