Tuning Evanix Conquest Parts

My Evanix Conquest selectfire gun has developed a slow leak at the charging nipple. The sealing rubber on the head of the piston has deteriorated. Does anyone know where this part can be obtained? Thanks
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Peel it off and replace it with an Oring. Good luck getting parts for that rifle , Evanix doesn’t supply their dealers with replacement magazines , let alone hard parts. This is coming from someone with more than a few of their rifles. If your really stuck Will Piat can help. Here’s his web page 

https://sites.google.com/site/saddlemountaingunsmith/