I have a Hammerli 850, in .22cal Bought it before the latest M2 model came out. They are Good co2 guns, accurate, they have thick walled German Barrels fairly light weight. Really a Very good gun, I will Not get rid of mine I have the 2x 12gram adaptor and 6 extra mags for my Hammerli. I also have a Crosman 1077, the 1077 needs to be Modified to get better accuracy out of it, as the barrel is quite loose inside the barrel shroud, you POI would be all over the place for a Out of the box 1077, as the barrel is able to Move around inside the barrel shroud, this is a common problem with the 1077s accuracy being all over the place, but is easily fixed for cheap, by using a piece of Foam or wrapping electrical tape around the barrel's muzzle end, Until the barrel to front sights slop/movement is Eliminated, then slipping on the front sight, You are trying to remove all the slack/slop/movement between the front sights ID and the Barrels OD, once this is done the 1077 is quite a Bit more accurate. I bought my 1077 to Modify, for when I get bored. I also put a oring on the valves detent so that I could get Maximum FPS out of it so it would be Much more co2 efficient, and reduce co2 leaks. I was also looking at making the Magazine a Manual Index to the next pellet, that way I could unlink the Trigger to the Magazine, this would make the Trigger much better/lighter and shorter pull length, as the trigger would NOT need to index the Magazine to the next pellet any more, that would be done under the Magazine manually. my Fortitude gen2 had the same sloppy barrel to shroud Movement, a Lot of Crosman/Benjamin guns have this sloppy barrel to shroud movement that can be fixed to provide a Much more accurate rifle.