Actually something I just thought about was the SAT (Soldat Airsoft Taiwan) VVD (Variable Velocity Device). RA-Tech is making one as well so yeah.
Redwolf sells the SAT one for $100 so that might be a viable option and you should be able to relatively easily change the FPS of your rifle so you can play outdoors in summer and indoors in the off season.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE