N/A Help with identifying this gun?

Neighbor just gifted me this gun from a collection he purchased.
I can't find any markings.
Any help would be greatly appreciated.
Thanks

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Looks like a custom crosman 2260 or something. Trigger looks different than a 2260/disco or even a QB78. Probably custom as well.

So it's probably a don cothran tube or similar. Is this HPA or bulk fill? Looks like bulk co2.
This is not made by anyone in the US. Definitely not Don or Crosman.