I bought it because it is fairly rare production airgun with production being less than a year. By the lack of replies I guess very few other airgunners shoots or collect these airguns. It is not as smooth as my S&W mainly trigger travel that cannot be adjusted. I bought it just to have another shiney gun. Randy
Good to see you got a S&W 78G, I have two of them, and I did have to modify mines. One was given to me by a friend who messed with it, the rear sights was lost and I replaced it with something off a Thompson Center muzzleloader rifle. The second one I bought on ebay, it was missing the CO2 reservoir cap, but I found the cap on ebay a couple of years later, and the pistol is complete. Both pistols had a serious gas leak between the valve and the barrel, there is only a metal to metal seal there, using a brass coupler. It needs a o-ring placed there to seal the gas. Because there isn't enough of a gap there, it is difficult to install an o-ring. On one, I just used electrical tape as a gasket/seal, on the other one, I made a new brass coupler that was a tiny bit wider than the original. Both pistols shoot OK now, there is still a slight gas leak on firing, I can feel it with my hands over the bolt, but accuracy of both guns improved a lot, and the noise is less than before. To take apart the pistol upper part, there is a tube behind the power adjusting screw at the muzzle end with a solid rod inside (use inertia to get rod out), then you need a 3/8" tapered rat tail file to stick in and pull the tube out. There are videos on this on YT. As for the trigger pull, I couldn't find a way to lighten it, mines are at about 1 pound, so not messing with it.The two stage power switch doesn't work as intended, it hangs up on the first stage before hitting the valve, so be happy with the lower power setting which can be increased using the power adjusting screw at the front.
David Is there anything you can do to reverse the grips breaking down? Something like armor-all or stuff to refresh plastics. Some guys use plastic spray shine. I don t but maybe I should be treating my plastic grips? Randy