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Oring and regulator

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Yes, according to the owners manual the regulator is externally adjustable. Here is a link to the owners manual on the FX USA website;

FX breech O ring part number is 2575
O-ring size is 6.35mm ID x 1.27mm CS
Material is NBR 70
Just so you know, I just went through with my Impact. You cannot get the 6.35 X 1.27 mm size. If you request it from FX they will send you part #4526, a 6.4 X 1.3 mm instead. O-Rings and More sells that same size for 5 cents each, while FX charges $1.52 each plus $9 shipping.

 
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Just so you know, I just went through with with my Impact. You cannot get the 6.35 X 1.27 mm size. If you request it from FX they will send you part #4526, a 6.4 X 1.3 mm instead. O-Rings and More sells that same size for 5 cents each, while FX charges $1.52 each plus $9 shipping.

Yup thanks I order all my orings from oringsandmore