^ that
Back in the day had my M249 on a 350fps spring, triple torque gears, G&P M120 motor, 7.2v 4200mah sub-C battery, around 700 or 800rpm as I recall. Went down to 600 for sure when the voltage dropped after 2000mah of use
I wouldn't go too low, remember the voltage drops on NiMH batts, so if you start at 450rpm, you'll have to change batteries when it's only half empty. I doubt you could even run an AEG off a 7.2v mini lol
I'd say LiPo is your best bet, but the 7.4v LiPo is still a lot of power.
Honestly the best way to accomplish your goal is with a MOSFET that has motor speed control and a 7.4v LiPo.
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