Longer range is fine with that set up, but you can easily get 150ft using 0.25g BBs at a lower fps as well, aka. my MP5 shooting 365fps w/0.20g BBs. Heavier BBs are best for range and for brush penetration, too many times I've had guys shooting 0.20g BBs at me with their upgraded guns through thick brush, takes me just a burst of two to get them, most of the rounds bounce everywhere. I use heavier BBs, and have upgraded to be able to push them better. Still, am not close to 400fps. Keep in mind, the springs you are looking at are in meters per second (use an online converter to sort out fps), and the bearing spring guide will add another 10-15fps onto top.
Overall looks good from my point of view.
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