High speed gears + 120m/s spring = lot's of current needed from your battery( way more than a mere mini is capable of. You'd be needing 3000mah+ and you simply can't fit it in that gun).
Torque up gears will let you run that spring with a lower mah-rated battery, but your ROF is going to be lower.
Your running pretty much at the limit of gear stress with that spring and HS gears. A standard ratio reinforced gear set will work as well.
I've seen EG700 motors turn guns at 450fps+ and 15 rounds/sec with the correct battery size and standard ratio gears. Your motor should be just fine for the job at hand, as long as you size the battery for your gear/spring combo.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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