OEM VFC HK416A5 Hop-Up Chamber

Hello you hoarders of spare parts, I know you're out there! I'm looking for an original complete (no barrel needed) VFC hop-up chamber for the Hk416a5.

If you're someone who's replaced their hopidi-doodah with a TNT version and doesn't mind parting way with the stock chamber for a few bits of coin and a plump hen, I'd be happy to strike a deal.