Pack of 6 liner spacer o rings for FX STX barrel liners (including superior and superior heavy).
These o rings space the liner in the liner housing.

Caliber specific, .177, .22, .25, .30

Fits the following FX air rifles:
– Crown and Crown MK2 (not superlight barrel versions)
– Dreamline (not superlight barrel versions)
– Impact X, Impact MK2, Impact M3 & M4
– Maverick
– Wildcat MK2, MK3 & BT