UR20Z
Dumpster Diver
I'm told that the right striker-spring cups will let a Glock be a shower/underwater gun, though I haven't yet tested that for myself. Something about being sized slightly loose so that when the gun is full of water, the striker can still move freely enough to hit the primer hard enough to light it. The "standard" cups, or so I've been told, seal too close, in effect, turning the striker into the piston of a shock absorber, so that, in theory, although it CAN be fired underwater with the standard cups, it's iffy as to whether it'll do so reliably.Oh, I might have one or two around here?. Still lacking a shower gun though.
Of course, for a shower/underwater gun, you're going to need properly sealed ammo to go with the correct spring cups, for reasons that ought to be fairly obvious to anyone not in a coma...