step 1: don't fix what aint broke unless you know exactly what it is you are trying to achieve with the new spring
step 2: research what each part in the gearbox does and how it relates to the parts that mesh with it
step 3: make your decision after considering the above points
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current armament: mk43, ump.45, p90, barret, m14, g33, k98, m4 tac, m4 swat, mp5 navy, vsr10, p226, m9.
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