Sorry if I jump into an old discussion, but i guide like this should never die!Recently purchesed a chinese co2 pistol carbine, the well known Artemis (snowpeak) CP2 AKA Diana Chaser and, after having experimented some trouble wit pellet feed due to the poor finish of the barrel breach (patially solved by some needle file work a wet and dry), I took a look at the crow and it seems a little smeared to me. With that corona virus lock down my scope has yet to arrive so i didn't bother installig the long barrel for a test (my basement in only 8 meters long and i tested pistol barrel that seem non that bad). Well reading your posts about recrowning i've come to the conclusion that the brass screw method is the ohe i could try without screwing up all (pun intended). The problem is : i cannot find such machine screws here in europe, can somebody sugest me how to find some screw that would do the job here in Italy or in the UK also? Us metric guys are complicated. Forgive my english, I'm italian and i don't have many chanches to write your language.