Feinwerkbau Mod. 601 Replacement Piston only #1758.261.1

If you have Feinwerkau mod.601 that have a different piston setup than illustrated like sealed with an o'ring or an aftermarket piston and want to replace with an original setup and you already have your seals. You need this.
Feinwerkau Mod.601 crank lever compressed air rifle
Mod. 600-602-603 uses a different piston body not same part number (but uses the same seals)