Bolt wise you don't have any options besides the stock cure5 as far as I know, but don't fret... It is a fine bolt. You can get pooty to grind it down but not recommended.
The heavier rammer is generally going to give you slightly less efficiency but a smoother overall shot cycle. Theory being that it is a more controlled speed and opens the valve/closes it at a more steady rate as compared to the lighter rammer that will need to slam a bit more quickly to actuate the firing sequence.
I may have worded that poorly if anybody wants to edit, but that is the basic thought of it I believe.
Hope it helps mate! Enjoy the marker!
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