I’m brand new here but I have been a Airgun enthusiast for a long time. I need help determining what kind of rifle I just received as it is very odd. It has Theoben marked on the barrel which is 10” long in .22 cal but the rifle itself has no markings visible? It also came with two .25 barrels one short 10” and one a bit longer. I say it’s odd because it looks like a Beeman R1 in most respects but has no markings on the receiver. It appears to have the Beeman two stage trigger also. Is there a way to upload pictures here for better clarity? Any help at all will be greatly appreciated!! Thank you!!