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Looking for Polyurethane sheets, 2mm thick and 90A durometer for CO2 seals The heading says it all but I'll elaborate. I have been successful with 80A durometer poly sheet but the seals will only take about 3 CO2 cartridges before the seals fail. I'd like to try a 90 to see if that improves...

A couple of months ago I was thrilled by my newly found ability to make replacement CO2 seals for my old style Walther PPK/S pistol from Umarex. They cut and went in easily and the cartridges would last a good long time, and I could put two to three cartridges in before needing a new seal...

The CO2 seals that come with the the gun just don't last and Umarex has never sold them. They used to sell the air valve which included the seal, but they are not selling parts anymore. With the advice of Member "Nervoustrig" I got the tools, leather punches in mm's, and the sheet...

In trying to do a complete rebuild of a Walther/Umarex PPK bb pistol I keep running into a roadblock. You can take apart the air valve fairly easily to a point- except the puncture piece which is beneath the CO2 mating gasket and brass retaining ring. Does anybody know the trick on this or is...

Umarex has stopped making the Walther PPK/S bb pistol and nobody has any in stock. It was the first BB pistol with blowback, and was made by Crosman initially, then Umarex with the help of Walther, which made this an exciting replica air gun design when introduced in 1999. I got mine back in...