Barrel Borescope
Silent Thunder Ordnance
There isn’t really much context or background necessary here. This is a borescope of a couple interesting airgun barrels we have on hand. We’ll probably add more airgun and potentially firearm barrels over time.
This is a borescope of an FX Crown .22 showing the STX barrel and the function of the adjustable port. This liner is the "old type" pellet liner, that is to say not a slug liner and not the new FX superior liner. Initially this barrel suffered accuracy issues due to leading, and was treated with JB Bore compound, which resolved the issue. The barrel has been rarely cleaned, not for hundreds perhaps thousands of rounds, and has shot exclusively JSB pellets since its last several cleanings. Accuracy is excellent. One can assume this barrel has likely reached an equilibrium level of leading, where lead is shed at the same rate it accumulates. Also of note is how readily lead deposits flake off on the borescope.
This is a borescope of an FX Crown .30 showing the STX barrel. This liner is the "old type" pellet liner, that is to say not a slug liner and not the new FX superior liner. The barrel has been rarely, if ever, cleaned and has shot exclusively JSB pellets. One can assume this barrel has likely reached an equilibrium level of leading, where lead is shed at the same rate it accumulates. These STX barrels seem strange in how they accumulate and shed lead, although perhaps some of their odd appearance simply stems from how rarely they're cleaned as they seem not to need it the way conventional rifling does.
This is a borescope of a Diana Stormrider. The barrel has been rarely cleaned and has shot primarily Crossman Premiere pellets. Both tool marks and substantial lead buildup are evident. This barrel has never been treated (such as with JB bore compound) but likely would benefit from it. While there are a wide variety of factors limiting the potential accuracy of the Stormrider platform, the poor finish of this barrel is likely one of them. A rigorous cleaning followed by JB bore compound or better yet fire-lapping would likely improve this rifle's performance significantly.
This is the barrel of an Airforce Talon. It has shot a mixed diet of a wide variety of pellets, and has been fastidiously cleaned throughout its life. The powerplant of Airforce rifles tends to leave something to be desired, likely robbing this barrel of its true accuracy potential. As it stands though, this rifle would be considered accurate by most airgunner's standards.