Hi Tom,
We have almost no alternate sheaths for our knives....BUT, this is your lucky day! We do have both nylon and leather sheaths available for the Government (also fitting the Government Agent and Desert Dagger). For acquisition, call my Consumer Services staff at 888.SOG.BEST.
In response to your other question, the MagnaDot was designed as the ultimate general-purpose knife. It's not a stabber. It's not meant to scare the crap out of someone. It's not a gentleman's knife. It's just an everyday general-purpose hardworking knife. I've heard people use the MagnaDot in a warehouse doing tasks like opening boxes/crates, on a construction site for just about anything (including a pry bar), worn on the hip of a maintenance worker, to store in someone's truck in case of an emergency, for dressing small game, as a companion while hiking...shoot, it can do almost anything (including scaring the crap out of someone). With Zytel handles, it is lightweight and affordable. Looking at the blade, it is a substantial piece that instills tons of confidence in the user, making him think that he can do almost anything.
I hope this helps.