Good morning,I found a 17.5 inch 20 cal LW barrel.I would like to install it on one of my theoben mk2 FAC.I would like to know if I could shoot heavy jsb at 900 fps or is it impossible?Thank you for your answers.
Barrel theoben .20 cal
- Thread starter blom
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Theoben & 15.9's at 900 fps in a 17.5" barrel ... With a high enough Reg pressure don't see it not being doable, but won't likely be very efficient at that output 
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Theoben & 15.9's at 900 fps in a 17.5" barrel ... With a high enough Reg pressure don't see it not being doable, but won't likely be very efficient at that output
the barrel transfer port is 4mm.what would be the correct regulator pressure?
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Correct ??? It will be trial & error on reg setting, hammer strike etc ... tho likely start reg at @ 120bar and go higher if required.
4 mm is @ .160" and perfect for a .20 cal.
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so for you it is possible, except that our shooting rate will not be high. I will use a 400cc bottle. If I work with a .22 cal valve, will it work? or do you need a specific valve? thank you for your reaction.
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