For various reasons I've had cause to photograph some barrels recently, and noticed a difference in the rifling geometry between two different .177 rifles. 1. 650mm Hunting 5, Circa 2014 (dirty!): 2. 550mm LG110, supplied recently (but appears the same as the original late 2017 example it replaced): Note that the H5 barrel has lands and grooves of similar width (typical Walther profile IME), while the LG barrel has skinnier lands / wider grooves and also appears to have more pronounced rads on the edges of the lands too. I always thought Steyr (at least under Anschutz ownership) used Walther barrels; do we think Walther have changed their profile, or perhaps Steyr are sourcing their tubes elsewhere? Alternatively, could these barrels be different because of the rifles they're fitted to, rather than the time it was made? Intrigue! Anyone got any thoughts?