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That setup sounds good. Three suggestions though.
1.) Make sure the Firefly bucking you get is the hard version. The soft versions will probably be severely deformed by the velocity that the M150 will output.
2.) If you're doing the sears and the piston anyways you might as well get the Zero Trigger instead. It costs marginally more than the parts it replaces and is an easier upgrade to install. (Replaces both sears and comes with an upgraded piston) Plus it makes returning the bolt to battery easier than with sears.
3.) I'm a big fan of barrel spacers. For an extra $10 why not?
0.30g BB's should be fine for that FPS level although you may want to try heavier ammo as well. I definitely would not go lighter than 0.30g though.
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