Now a few thou bigger to fit all guns.

We had to make them slightly larger as many older guns had a bigger tube run out. So now they fit perfectly or slightly oversized. Easily adjusted. Follow Tesla seal info if your tube is tight.

http://www.airguns.citymax.com/catalog/item/251485/834669.htm

Custom Piston Seal For Pistons Taking Synthetic Seals.

For R7-HW30, HW77-97 old 25mm, R8, HW50,55. etc.

Also can replace old Zephyr sealed UK guns.