Considering your able to swap barrels from a .35 to .22 I believe the transfer port diameter is the same. I am trying to find out the o-ring size that’s inside the barrel behind the pellet. I want to say it’s 9mmx1.5mm NBR70
Why I am guessing that is because of this.
For the .177 they used 4.3mmx1.5mm NBR70
4.3mm to inches is 0.169291 which is close to .177
Then on the .22 they used 5.5mm x1.5mm NBR70
5.5mm to inches is .216535 which is dang close to the smallest .22 diameter they offer .216-.218
Then on the .25 they used 6.4mmx1.3mm NBR70 6.4mm to inches is 0.251969 close to .25
And .30 they used 7.5mmx1.5mm NBR70
7.5mm to inches is 0.295276 close to .30 and seeing the selection of o-rings from
http://oringsandmore.com 9mmx1.5mm NBR70 might work being that 9mm to inches is 0.354331 . Now I’m not sure about the thickness of o-ring but from barrels .177-.30 they require the same o-ring on the outside the transfer port (two of them) 10mmx2mm NBR70 and being that that .35 is able to fit in the same slot, it most likely is the same size transfer port. And using .25 and .30 o-ring measurements. 6.4mm (inside measurement of o-ring. ) plus the two 1.3mm for the thickness of each end of o-ring gives you a total length of 9mm inside the transfer port that oring is covering now with the .30 it uses a 7.5mm x1.5 making it 10.5mm from end to end.(7.5mm+1.5mm+1.5mm=10.5mm) seeing the jump from .25 to .30 (.05” size up equals 1.5mm in length to oring..) from .30 to .35 I’m doing the same jump so 10.5mm +1.5mm is 12.. and to get 12 mm outside diameter of o-ring. I believe 9mmx1.5mm equaling to 12mm outside diameter was the same jump in size Cause if you did 9mmx1.3mm it would be 11.6mm in diameter of the oring which wouldn’t be the same “proportion/jump” like the .25 to .30.
Final guess from me, 9mmx1.5mm NBR70 . if you ever find out from fx support about YOUR question of if being example the same .. please post about it!
thanks!
