i guess i'll echo tmb's thought-- never seen that. just out of curiosity, why would you want a metal butt stock extension? do you mean the thin little plastic butt plate that ruger puts on all their 10/22s to be replaced by a metal one? or an actual metal extension that's thick? i could see the metal butt plate, as some folks don't like the cheap plastic, but i've never heard of an extension for a 22...is it possible to mount a metal but stock extension onto a wood 10/22 stock? if so, where would i go and how would i go about doing that?