BTW.... according to Hajimoto, this is somewhat of a rare bird. They don't make the Gauntlet in .177 anymore.
I have 2 of the Gen1's in .177 and one in 25. I put one in a QB78 stock and it lightened it up quite a bit. The .25 has such a small leak that it doesn't matter if I top it off and go shooting. I haven't shot any of my pellet guns in over 2 months, but when I do shoot them I always pull those three out to shoot. Much more accurate rifles than I am a shooter so they make me happy.