my m16 run about 320fps and i'm still able to shoot .28 bb's and have the distance to reach out and touch someone,with only those minor upgrade and running a modify s90 spring.My friend as a kraken ak with the same set up and he makes me run for cover when he's shooting at me.Also a weaker spring will help lower the stress on you're gearbox internal.The kraken ak only has plastic bushings and the gear are not the same quality has the TM,CA,G&G,JG,etc...
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okey dokey lokey
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