Shootall-
I would guess the barrel on the Walther is about 3 1/2. Its got a decent double action trigger, a real nice single action pull, good adjust. sights, and I like the different replaceable back straps that allow you to fit it to your hand. I can keep a group about the size of my fist at 25 yards. Not bad for a compact little auto. If I feel the need, I usually carry a short barrel .44 spec. / mag. when in moose country.
The thing with a good holster is it should keep the gun far away enough from your body that if it goes off, it will miss you. I love my .45 auto's, and carry them cocked and locked, but always use a holster that places a retention strap between the frame and the hammer. The only striker fired autos I really feel comfortable carrying is the Glock, but thats just me. Like I said, I own and use several Ruger autos for tree rat huntiong, I just make sure they are in a proper holster..
The pic below is 2 of my favorite "back pocket" guns for woods walking.
Larry