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I agree 100% with the above responses.
In addition to all of the above suggestions, a common drop-in that I've upgraded for many (former) clients was a high torque motor. Depends what spring is in your KA though, the ones I used to work on were the early ones in Canada during the time when most imports came in with higher FPS (~3 years ago). Stock KA motor is fairly anemic for the M120-M130 springs that they used to be shipped to Canada with, even with 11.1V LiPo packs.
On the topic of air nozzles, those KA/Cybergun Colt M4's from 3 years ago occasionally had feeding issues out of the box due to off-spec air nozzles that ran a tiny bit longer than was necessary. If this is still the case, do get the shorter variant of M4 air nozzle - in Guarder/Prometheus terms it is labelled as for M16A1, not M4A1.
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