K-Bars are good knives for what they were designed for. But they were designed for combat and not hunting. In my humble opinion you don't need that much blade. Anything more than 2 or 3 inches is excessive for field dressing and skinning and there are better knives available for boning and butchering tasks.
I have my grandfather's K-Bar from WWII but his was Navy issued and not USMC. He was in the Philippines at the Cavite Navy Yard in 1941 when the Japanese invaded on Dec 08 and was there fighting with the guerillas until the Philippines were liberated by U.S forces. This one has the stacked leather handle and a big aluminum knob on the end of the handle for crushing skulls. I know of at least 2 Japanese soldiers my grandfather killed with it. When I was active duty I carried it as my battle knife instead of the garbage they issue now. For close quarter combat the K-Bar is hard to beat. But it ain't a hunting knife.