Theoben Rifle?

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!!




 
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As it turns out you are absolutely correct. It is a Anshutz Theoben barrel and today I sighted it at 30 yards. It likes the artillery hold and 14.3gr. Pellets. 
it shoots easily under 1/2 inch groups. Cocking effort is aggressive with that short barrel but easier with the two handed method. Thanks for all the help and information!! So I’m guessing someone bought the parts from Weihrauch and that’s why it’s unbranded as they were sold as spare parts? The gun shoots amazing and is accurate. Next I will chronograph it but my guess is in the 850fps. range to maybe 900fps. Cheers!!