Dealing with a loss in accuracy can be a frustrating experience, especially when you think you’ve tried everything. It can also be frustrating when you buy a second-hand air rifle, only to find it’s not shooting as well as you were expecting and you can’t quite work out why. It could be a problem with the bore, but the only way to find out for sure is to take a look using a device such as the Teslong Wireless Borescope Model NTG 100 W from Walker Rifles.
The camera and mirror assembly can be focused for barrels of different calibres by screwing it in or out and then securing the lock ring
Your barrel may just need a clean, but the bore may also have suffered some form of damage from poor machining, overzealous cleaning with a rod and jag, or simply being neglected and allowed to rust. Borescopes have always been fairly expensive, making their purchase hard to justify for the individual shooter, but the Teslong costs £95 including postage, and can be used with any barrel of .22 calibre and above, making this device more accessible to the average airgun shooter.