On the longer barrel and maximum velocity - yes the 24" barrel is probably longer than needed for maximum velocity - but this is an old design and the longer sight radius was more important before scopes became so popular. Also, the longer barrel allows for a longer ammo tube - so more rounds before reloading. That said, If I could only have one it would be the 39D or the mountie. One thing that really bothers me is that the never made and version of the 39 in stainless. A 39D in stainless would be the perfect 39 for me.
