Yes, you can play a few season with the stock VFC piston, but be sure to check AOE, Shimming of bevel gear and do the premature engagement mod. I had 6 stock VFC all had stripped pistons at the same place. It was due to AOE and second last tooth wasn't removed. Now if you have the know how to do these fixes before using, get the VFC. If you don't KWA is better IMO.
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