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I run mine on CO2

April 16 2012 at 5:03 PM

Gary in St Louis  (Login SirTonySteel)
YFOT


Response to Modding/Tuning A .22 MRod for max vel/power with CO2?

Open the valve adj screw 4 turns out from bottom. Bore the transfer port to .125 inch. Back both hex adjust screws all the way out and use just the bigger .25 inch (?) to increase striker spring tension until velocity hits max. Any more than that will release so much CO2 and chill down the volume and reduce velocity. Increase until the velocity drops. Do this with a heavy pellet to get all the push available. The HDD will only make performance better. Mine is getting 525 fps with a Kokiak (21.1gr) at 68 degrees.


    
This message has been edited by SirTonySteel on Apr 16, 2012 5:06 PM


 
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