I am reasonably confident that this is an early Daystate Air Ranger FAC model from the mid-to-late 2000s, rather than a later MkII.
Key clues:
• The thumbhole walnut stock is the original Air Ranger style.
• The large buddy bottle appears to be the 400cc version.
• The 10-shot rotary magazine shown separately is the early Daystate magazine used on Air Rangers of that era.
• The action is the original mechanical bolt-action Air Ranger design.
• The bottle stamping appears to include "200 BAR", which is consistent with the original Air Ranger system.
• The serial number SB 0582 suggests an earlier production rifle.
One thing that stands out is the marking on the bottle that appears to read ".22 AIR" (the photo is slightly blurred). If so, that would indicate the rifle is chambered in .22 calibre, which was probably the most popular Air Ranger calibre sold in the UK.
To confirm the exact specification
Could you take one close-up photo of:
1. The barrel near the breech or muzzle showing any calibre marking.
2. The writing on the air bottle (especially the part showing ".177", ".22", or ".25").
Approximate value
Assuming:
• It is sub-12 ft-lb or FAC and in good working order,
• The bottle is still in testable condition,
• It includes the magazine and scope,
Typical UK second-hand values today are roughly:
Specification Approximate Value
Sub-12 ft-lb Air Ranger £450–£650
FAC Air Ranger £550–£850
Excellent condition with quality scope £700–£1,000+
Regarding your earlier question about single-shot use
The magazine shown is removable. Many Air Rangers can be used with a single-shot loading tray that replaces the magazine, but whether yours already has one depends on the exact model and generation. If you pull the bolt back and remove the magazine, a pellet can often be hand-loaded directly into the breech, though a proper loading tray is generally more convenient and reliable.
If you can provide a close-up of the calibre markings and tell me whether the rifle is on a Firearm Certificate or is a sub-12 ft-lb rifle, I can narrow down the model year and likely market value much more accurately.