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The G&P 249 also uses standard V2 contacts instead of a microswitch, allowing it to use any AB FET out there.
The box mags are designed to hold large batteries in them (great for the PARA model).
There's no mechanical safety, and so the safety is to unplug the battery between the box mag and gun, making it actually MUCH safer than the CA style which can actually short and start firing at random (Rare, but seen it happen myself twice).
It has a reinforced carry handle base, so it won't snap off.
Has a centerline feed system instead of feeding through the magwell, this makes it a bit more reliable.
The V2 mechbox in it is not particularly prone to cracking at all. With the simple addition of a sorbo pad, two G&P 249s I've built have done over 200k rounds each at 400fps and 25rps without cracking. The sorbo's even make the weakest of weak shells, the marui shells, withstand up to 470fps when they'd normally crack at 350fps.
Something I didn't even realize was an advantage until upgrading an A&K, the front sight post doesn't wobble AT ALL, so your barrel remains as rigidly centerline as it does in any other AEG.
Downside is it uses thinner bearings on the bevel gear in order to fit the lower, and at least in the older models, the rail on the handguard was mounted at an angle.
As far as efficiency (this can be achieved on any LMG) I was running 26:1 triple torque gears on an EF1300 motor with 11.1 lipo. Low torque, high speed. 25rps and 350fps, at best got about 9BBs/mah. That's about 350mah for a 3000 round box mag. Closer to 7BB/mah at 400fps.
Full auto is more energy efficient than semi auto to start with, but running low torque on a set of very heavy gears (prometheus) keeps the momentum up with minimal energy. And because the motor has so little torque, active braking barely has any negative effect at all. I ran about 120k rounds through the EF1300 motor before the comm was too dirty to conduct any more. Cleaned it off and it kept on going.
And because of the ability to use any FET on the G&P, you can sue a chimera FET that has motor speed control. So if you want it to shoot slower than 25rps, you can just lower the motor speed in increments of 10%
And the weight on the G&P is actually closer to 7.5 to 7.8kg. The weight difference between them and the CA is significant. I can handle the CA249 like a rifle, can't do it with the G&P lol
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