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I've seen 30-40fps drop also. Don't worry too much about it, considering the knietic energy has gone up, necessary for getting BBs farther and more accurately, and to also help punch through light brush, both which means you'd use less ammo than if you were using 0.20g BBs. Been cases where my 0.20g has bounced off light dead grass, took MANY rounds (the one that comes to mind, the guy was about 50ft away behind the dead grass, took me 1.5 locaps to hit him) to get the BBs through (my MP5 was shooting 350fps then) where heavier ammo would have taken me 3-5 BBs to do the same thing.
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