Regarding cleaning, it is very easy if you look up my method. I find that grease, which is present in copious amounts in the action (at least in mine) finds its way into the barrel, degrading accuracy. Maybe I just had a very grease-happy assembler but my back spring was literally encased in it.
GTOs. I have no issue with lead, it’s all based on performance and ease of use:
1. They are very hard. This means I can push them in to the stock gate without pressing down the plastic flange, which can bend the skirts of softer lead pellets. They require no seating and will not move from the back of mag as it rotates. This makes for very quick loading and zero jams/hiccups in 10k rounds.
2. They are very accurate. Because they sit tight and are hard, they do not get damaged by the violent act of mag rotation or shooting from the mag into the barrel. I discovered that benefit with the K1 rifle and found it was more pronounced with the GK1. They never yield flyers and shoot sub-MOA from this pistol.
3. Light weight can be beneficial, if it’s heavy enough. 16 (or less) grain lead pellets are too flimsy for this pistol and get chewed up, generating inaccuracy and wild flyers. In .22, the lightest lead pellet that I find acceptable is the (harder lead than JSB) JTS 18.1. I still see bent skirts in the mag and the target (soft duct seal) and get flyers as a result. I also find that all Hubens shoot more accurately at higher speeds, 880 and above. That’s a lot of FPE with an 18.1, but only 21fpe with the 11.75 grain GTOs. Lots of guys want big power but, for me, 21fpe is plenty. Also, the GTOs have the same BC as JSB Hades - validated at the UA range using their fancy chrony. They shoot very flat from 28-45y and are useful out to 60 or 70y. Shooting at 900fps/21fpe, I can shoot a mag with an ES of ~8 from 260bar then refill and reload. That better than many regulated guns and contributes to their crazy accuracy. Finally, lower power = less noise and less recoil/flip, the latter of which also means better accuracy. In summary, I find I can do more of what I want with less, aside from the cost!
Downsides. Cost is 3X that of regular pellets. I buy sleeves from UA and get a discount but they’re still pricey, but worth it to me. Other downside is that because they are so hard, they don’t expand. I can pick them out of duct seal and they look completely undamaged, aside from rifling marks. I could probably shoot them again and again but I don’t. If they hit metal, they flatten right out. Either way, since I shoot a lot in my yard, it makes for easy cleanup. Regarding pesting, many would be leery of their inability to expand, but in practice, I have found them to be just as effective, in terms of DRT, as Hades etc.
Well, that’s my complete GTO manifesto. Several people have at least corroborated their accuracy. I gave up preaching about them long ago, because (as I said), fellas gotta be fellas. I don’t know of anyone who has tried the 25s and it could be that the stars just don’t align in that caliber. Would love to know because I’m always close to pulling the trigger on another gK1, but trying to hold out for 177.