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https://preview.redd.it/d3tzgqwxo7hc1.jpg?width=3024&format=pjpg&auto=webp&s=bbdf93be07cd75711820e384aab097f3910209ee

That's the picture of my Umarex LEGENDS MP's CO2 cartridge pin/seal located at the bottom of the magazine. Every post I read before said the cartridge pin/seal should have a rubber seal surrounding the cartridge's nipple but mine does not have any rubber. The greyish white circle on the picture is just a light reflection by the way. I could not find ANY rubber part. By the way, this magazine and the gun just arrived so it's completely new and I did a test shooting over 200 bullets and it worked perfectly. So is this magazine supposed have no rubber part at all? Also for more context, the link below shows pics of the whole magazine.

https://www.google.com/search?q=umarex legends mp magazine&tbm=isch&ved=2ahUKEwj28vP_9ZmEAxVCNGIAHQKEB_YQ2-cCegQIABAA&oq=umarex legends mp magazine&gs_lp=EgNpbWciGnVtYXJleCBsZWdlbmRzIG1wIG1hZ2F6aW5lMgcQABiABBgYSPcOUMkHWMcOcAB4AJABAJgBRaAB6AOqAQE5uAEDyAEA-AEBigILZ3dzLXdpei1pbWfCAgUQABiABMICCRAAGIAEGBgYCogGAQ&sclient=img&ei=atTDZfaVOsLoiLMPgoiesA8&bih=638&biw=1330&safe=active&ssui=on#imgrc=uTg4tuJuLMdOJM