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If you have a stock or PDI barrel that's 14.5" or SHORTER, you need a ported cylinder to get the best use of your spring.
If you have a barrel that's longer than 14.5" or is an ORGA 6.13 in specifically a 14.5" length, you need an unported cylinder.
If you have a stock barrel, M110 spring in a ported cylinder should do 380fps easily.
If you want to bump it closer to 400, you can get an ACM spring guide collar kit for PTWs, which are shims you stack on your spring guide to bump up fps a bit.
Being used, you'll want to regrease the cylinder, but you can't use the same grease you use on AEGs (it's crap), you have to use systema cylinder grease of tamiya ceramic grease.
RSOV will have both vanaras springs (same rating-fps as systema springs) and ACM spring guide collar kits
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