It probably does seem heavy since I believe they have been making it the same way basically for 40-50 years. All these new steels and light weight knives may have you used to a different feel.
Like you said though, give it a few days. There is a solid quality in that knife and it started a whole new way of looking at folders. So it's a collectible as well as a strong and heavy hunting pocket knife. I believe something with the way it locked was a new invention. You would have to ask the Buck guys here, they should respond to you soon when the get online. I like the Buck 110 and it's smaller version, the 112; I have one in my tackle box right now.
I always did think the 110 was a bit of a beast, basically a fixed blade made into a folder. To carry in my pocket I prefer the 112 Ranger. The 110 I like also, just to carry in a tackle box or bag.