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The turbo should be fine with an M120 but have you considered the red magnum motor? It delivers a much higher rate of fire than any stock motor from any company I know of and has the torque to not slow down as much with the load of an M120 spring. With an M120 the stock CA gears will break down eventually and strip, that or the piston will go. You could get torque up gears and a turbo motor for high rate of fire and enough torque to not break anything with the M120.
Just my $0.02, I have no experience with CA249's or M120 setups (I use tightbores and airseal nozzles to get 400fps from M110's but a tightbore will kinda defeat the purpose of a support weapon.)
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