You should be running torque up gears for that sp120 spring and a large battery something like 9.6v 3600 mah and a hefty motor such as a EG1000 or something else that has good torque.....systema magnum or G&P 120 or 140, then you will be set.
Why not just keep your Dpms m4 stock, perfect for cqb games and invest in a good quality m4 such as a G@P, TM, CA.....
best of luck
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