G&G Scar Hop unit

[Rogue9]

Hi all,

Not long ago i got a scar l in a trade, long story short it had had it. however ive had it all fixxed up and now its as good if not better than new. However theres one thing that we could not change or find the part for, which is the hope unit. the old hopunit is still working but is full of some sort of gunk that i cant get out so id like a new one.

Just wundering if anyone has any idea of where to get one from as i cant find a single stockist on the internet,

Thanks