Need Help Identifying Pistol and System

All, new to the forum and am in need of some help. I came into possession of an over/under air pistol yesterday and need some info and help identifying. It has no markings on it, has a red laser, has a spring-loaded trigger action. Appears to be 30 Cal, looks like some kind of pre charged compressed cylinder that screws onto a shell barrel and rim that once together slides into the pistol. I am attaching images for review. Any help is greatly appreciated.

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