I'd say that 14.5 pounds for a precision 20 inch 308 semi-auto is pretty par for the course. I weighed mine after today's shooting session at 14.4 pounds with the same items installed as Ryan (except the vertical hand grip).
During our range session, we decided to pull off the 20 inch barrel and install the 16 incher. I took some pics, but they really weren't necessary. Steps were: remove one bolt....loosen another.....remove barrel. Reassembly is opposite (Duh!), with torque specs provided.
What was really sweet was that after switching from the 20 inch tube to the 16 inch one, the bullet impact (with same ammo) shifted approximately 1 1/2 inches. Later, when he re-installed the 20 inch barrel, POI was right back where it was before the swap. That is damn cool in my book.