Depending on how tight it is you should be ok with a type 0 cylinder or a bore-up kit especially if you use a tighter barrel. If its a stock barrel, 6.08+, than you should be able use 590mm without drastic negative affects. I do believe you need a 590mm barrel for the RPK. I would not use a 6.01mm due to barrel suck, stock might the best way to go on this one. If you need to bump your FPS a little add a spacer on your spring guide, tweak your compression or use a stronger spring.
Last edited by mateba; November 19th, 2007 at 12:29..
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