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1. Lipo indoors? Yes
2. is 30+ rpm for indoors necessary? No...but your trigger response on semi will be nice. Extended full auto bursts at indoor ranges will really hurt.
3. The piston head is an upgrade, not a downgrade. I can't stand those solid aluminum piston heads...especially after the damage it did to one guy's rifle.
4. The S90 spring will be just perfect.
Have fun!
Tys
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