Shopping cart FX STX Barrel Breech O-rings (Pack of 3) Pack of 4 inner breech o-rings for the FX STX Barrels. This is the inner barrel breech o-ring for the STX barrel systems. - FX Impact (All Generations) - FX Crown - FX Dreamline - FX Wildcat MKII & MKIII Qty: 4 .177 Size - #C1-4.5 (FX Part #2529) .22 Size - #C1-5.5 (FX Part #19726) .25 Size - #C1-6.35 (FX Part #2575) .30 Size - #C1-7.62 (FX Part #19209)
