Umarex First Air rifle - Notos with some upgrades

[Squirrel hunter]

I think it is a Buck Rail.

moderator – Buck Rail

buck-rail.com

I may be wrong though. It looks like that might be specific to a different gun.

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[snowtosea]

Yes, it is the buck-rail with the picatinny rail back. I then attached an AK style folding stock that attached to a picatinny rail because the UTG folders are no longer available