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the G&G blowbacks are prone to decreased velocities due to the Pneumatic blowback feeding directly off of the cylinder. i've owned a few of them and it's a normal side effect of the gun. now that said i'm not sure if 40FPS is a normal drop. i didn't chrono the difference when i plugged the blowback feature. (small piece of electrical tape means i could remove it later if i like)
APS guns have a blowback feature that runs off the gear system meaning no loss in pressure BUT they work of the gears so unless you chip the trigger it could be open/partial/closed whenever yo stop firing.
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