systema turbo motor is ideally suited for an m100 spring. With and m120 you're better off with the g&p m140 or 160. And i'd go with a g&p drop in. I'm getiing about 22 rps with a g&p drop in and m160 motor on a 7.4v 20c lipo and 21 rps on another g&p drop in and Systema magnum motor same battery. Both are far above and beyond what you'll need for an spr.
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