Picture above tell us everything about "upgraded" cylinder head made by PDI.
The product itself has a pricetag of around $50. Hardly Affordable (for me). It`s a nice upgrade to have on your rifle, but if you are short on cash (like me), there is a way to achieve similiar performance, just by using stock ones. It takes some work, but the result are worth it. So, let`s begin.
Basic Idea:
We are going to make our stock cylinder to produce better airflow (as previous picture said :D).
I often call this mod "Port &Polish". If you are an automotive fan, you might know this term, for those who doesn`t, Port &polish is a method of increasing engine`s performance by enlarging and smoothing both of intake and exhaust port for better airflow. It`s the same method we will be using.
Tools Needed:
Dremel/ Drill
Sandpapers ( Coarse one for removing material, Fine one for smoothing)
Polishing compound ( ex:Brasso)
Piece of cloth
How to:
1. Disassemble your rifle, until you can take out cylinder head, then remove O-ring on cylinder head.
2. Put your cylinder head nozzle on dremel/drill head and lock it.
3. Your cylinder head will turn as you start your dremel/ drill, start sanding the edge of cylinder head until no sharp edges left on it, but don`t take too much material away, or fps will drop!
4. When the you are satisfied with the shape, dip piece of cloth to polishing compund, and polish cylinder head
5. Clean up the whole thing, install O-ring back, and assemble the rifle, and we`re done. :D
Doing this mod will give you +5-15 fps, and more consistent fps which means better accuracy &grouping.
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