I would go with Stephen's assessment (especially because he sells QB's). Actually, the TF-99 is essentially the same as the QB 36-2, not the QB 36-1. I have a TF-97 that I purchased from Compassecco (basically the same gun as the QB 36-1), and it has a different receiver cap as well as a slightly different catch/front sight assembly. South Summit sells the B3-3 for $49.95, so it looks like you saved the shipping costs on your new rifle!
for certain without some additional pictures, but looking at the link you provided convinced me even more that Storz has a B3-3. The QB rifles have ventilated recoil pads, a metal receiver cap with a separate scope stop, and two levers inside the trigger guard (for the safety and anti-beartrap release). Conversely, the B3-3 and (from what I can tell from the photos from Storz) Storz' rifle have a larger plastic receiver cap (no scope stop), a solid plastic butt pad, and no levers (other than the trigger) inside the trigger guard. There also appears to be a tab that extends below the cocking lever on the catch/front sight that looks the same in both.
The markings on the receiver indicate the factory (the "I" in the diamond in the middle of the stamp is the "Industry Brand" insignia). As Industry makes both the QB 36 and B3 models, that stamp would appear on both.
If you're shooting 14.3 grain pellets at 700 fps, you almost certainly have a QB 36-2, or TF-99. As I said, I have a TF-97, which is the same as the QB 36-1, and its physical dimensions and power level are more along the lines of the B3 models.
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