Mk3 wildcat problem

[Fac]

Hi this is my first post from UK lads and lasses I have a mk3 wildcat sniper 700 in 22 and I keep getting a puff of air through hole in block in front of reg gauge I seen a vid on the tube and it said it was small 1x1 1/2 oring on valve iv changed it a few time but after a few shots it starts again any help would be appreciated thanks allan

 

[WorriedMan]

Fac,
Welcome, always nice to have members from across the pond. My Mk3 Wildcat Sniper.30 is functioning well, thank you, however owning one does make me take notice of Wildcat threads. Small voice in the back of my head is saying someone had a similar problem only to eventually discover a small crack in the metal. New seal worked until sharp edges damaged, leak resumed. Hope this helped, WM

 

[Fac]

Thanks for reply wm iv tryed everything I can with gun I bought it second hand and everything the owner put on it aftermarket iv changed I.e the huma dual transfer port pin probe iv changed new valve and valve seat even changed the hole block and its not as bad now but still getting odd blow back onto face and when it's doing it its changing the power its got me baffled I love the gun I'm shooting it more than my mk2 impact in. 25 but was hoping it may have been a easy fix or someone may have had same problem as more people have fac guns over pond than here in UK cheers allan

 

[madeintheuk]

Maybe a burr on the valve rod damaging the oring after a few shots. I would remove the valve and look at the rod. Make sure it’s perfectly smooth.

 

[Fac]

Maybe a burr on the valve rod damaging the oring after a few shots. I would remove the valve and look at the rod. Make sure it’s perfectly smooth.

Iv had 2 different Valve rods in it the one what was in were oring is was 3.64 mil and bought a new one which was 3.76 mil from shop and wudnt go into hole at block so took a bit off till it went in very fine tollerences thanks for reply