By Peter Makulek · Senior Optics Editor · · Live prices from UK retailers
A laser bore sighter lets you get a rifle scope onto paper at short range without firing a shot — useful when mounting a new scope, swapping between rifles, or re-zeroing after a knock. For air rifles especially, where pellets are expensive relative to rimfire and each misaligned shot wastes time at the range, a bore sighter is a practical tool.
There are two main types: arbor-type bore sighters (a laser mounted on a barrel-calibre arbor that inserts into the muzzle) and magnetic bore sighters (attach to the crown magnetically). Arbor types are more accurate as they sit concentrically in the bore; magnetic types are more versatile across calibres but slightly less repeatable.


via Optics Warehouse
£19.99

via Optics Warehouse
£24.99
For air rifle use, an arbor-type bore sighter in .177 or .22 (whichever matches your rifle) gives the most consistent results. Set up at 10–15 metres, align the scope crosshair with the laser dot, and you should be within a few centimetres of zero when you go to the range for final adjustment.
Bore sighters save you ammunition and time on zero — they do not replace live-fire zeroing. Treat bore sighting as "on paper at 20 yards" rather than "fully zeroed". Always confirm and fine-tune zero with live pellets at your intended shooting distance.
A laser bore sighter is a device that emits a laser beam aligned with the centreline of the rifle barrel. By aligning the scope's crosshairs to the projected laser dot (usually at a wall 10–20 metres away), you set an approximate zero that should put your first shots on paper. It eliminates the need to fire multiple adjustment shots from a cold zero before getting on target.
For getting within 2–5 cm of zero at 25 yards without firing a shot, yes — a quality arbor-type bore sighter is very effective. For a final zero for field target or pest control shooting, you still need to fire and adjust at your intended range. Think of bore sighting as "getting on paper quickly" rather than a substitute for live zero confirmation.
You need a .177 (4.5mm) arbor. Most bore sighter kits sold in the UK include multiple arbors in common calibres (.177, .22, .243, .308, etc.). If buying a standalone arbor, match it to your barrel calibre exactly — a loose-fitting arbor will give inaccurate results.
Yes, a muzzle-end arbor bore sighter works fine on a break-barrel air rifle. The muzzle-end insertion method is calibre-specific and accurate regardless of action type. Avoid using a chamber-insert (breech) bore sighter on a break-barrel as the arbor design assumes a bolt or straight bolt-action breech geometry.
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