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Found at the webside from Huma Air

Does anyone know what material the brown high-pressure sealing rings are made of? Delrin or Teflon or another plastic? Since spare parts are often not available, or with a waiting time, I want to make my own in stock. I think white Teflon is too soft. The brown plastic feels harder when it comes...

So, I set out to improve the Challenger Bullpub Cal.50. The changes are: Adjustable and harder hammer spring, all sliding surfaces polished. Inside polished barrel with new 15 degree crone Valve with 1.5mm more stroke and weaker returnspring. HumaAir regulator with additional power plenum...

The difference...old on the left, new on the right

700mm LW barrel cal..22 700cc bottle Huma Air regulator at 175 bar.... ZAN slugs 30,4 grain -1003 fps Modifid Valve and harder spring, big adjusterknob Sekhmet gauge Element 4-24x50 with Pard NV 007lrf Nightvision Carbon bipod and a lot of other thinks I´m from Germany and at the moment in...