"Scirroco"Might have something to do with money?????
Rgds steve
That answer doesn't explain why over the last year of videos he's featured several models by various manufacturers, including other models from Air Arms. I checked through his video playlist of the last 12 months. He highlights three models from FX, a Daystate Wolverine, an Air Arms tx200, an Air Arms TDR, a Colibri, and a Cricket. The only recent video he has of the Air Arms S-510 is pieced together with footage that he shot a long time ago. He just doesn't seem to shoot the S-510 anymore, or at least if he is, he isn't filming it. I think this says a lot since his Channel is named "AirArmshuntingSA" Don't take my word for it. The following is a direct copy and past of his post on the subject in a thread from right here on AGN.
Matt's post on the subject...............
Ok, let’s hear it from the source

I thought I didn’t need a regulated rifle… Until I shot with one and saw the difference. When I filmed the review of the .177 S510 a few years back I had just switched from springers, so naturally I was happy just to get 30-40 usable shots from the gun.Then as things progressed, I had opportunities to shoot (and own) Daystates, Kalibrguns, FXs, Weihrauchs, Steyrs, etc and my eyes were opened to the “way things could be”.When I bought my Wolverine B, I realised the value of having a higher shot count. But of course, this was due to the larger cylinder and not a regulator.The Wildcat changed everything. Tiny gun with a small, light cylinder… But an impressive shot count due to efficient valve and reg. So I regulated my S510 to try get the best out of it (with good results). However I hate the idea of installing aftermarket regs that void your warranty and can give issues. Just get a rifle that has a factory installed regulator!I sat with Air Arms in a meeting and told them that a regulator was pretty much non-negotiable. I think they listened to an extent, because the Galahad is supposed to be regulated, but with only 40 shots per fill from the Galahad, it’s clear that the gun is still nowhere near as efficient as the Wildcat.What if there could be a larger cylinder AND a regulator? Enter the Impact – An absolute beast of a rifle. If you turn the reg down to 110 bar you can get 170 shots per fill at 33 foot pounds! Needless to say, it’s my new favourite.I still love the S510, but its difficult to reccommend a gun that is long and heavy but, although very accurate, doesn’t have the technology that Daystates and FXs have. Wait for the Streamline. I saw the first model at IWA, and I can promise you that it is going to make the S510, Huntsman, Marauder etc look like antiques (in terms of performance, not looks)
Matt