Pictures of the stock. The lug is part of the aluminum bedding frame.
The fit is VERY good. Paper slides between stock and barrel all way to receiver.
Stock weighs 31 oz on my trigger pull scale (old stock was 26 oz)
Most aftermarket stocks are of better quality than Factory stocks. Most of them will let you accessorize more than factory stocks. It kinda like a Chevy going to a Cadillac. Most shooters think it helps improve accuracy.
Every man needs a good woman, good dog, good horse and a good gun.
from an accuracy stand point there are two main things that a good stock will do. the first is more ridgid. I know that when I use a sling to steady a free hand shot I put a considerable amount of force on the stock. The second is temperature/weather stability. If the stock is changing stiffness and actual size with heat and moisture it changes the bedding surface.
Injection molded stocks are teribble for changing in heat. wood is bad for changing in moisture. Fiberglass/Arimid fiber are the best, alluminum bedding blocks are great too.
Custom stocks can improve in various areas. Firstly the shape, most factory hunting stocks are designed for open sight cheek weld position. A stock purely designed for scope use will fit much better. Then material, as some have mentioned before composites seem to have the upperhand with carbon fibre being the high end.
These new materials and modern manufacturing methods in stocks can do more for us. Ultra light stocks automatically raise the centre of gravity closer to the line of the bore which in turn improves the way the rifle recoils. If one prefers extra weight this can easily be added very close to the bore line in the sides of the barrel channel and the top of the comb, once again improving the way the rifle recoils. Last season I made myself a remmy 243 with a carbon fibre stock that weighs around 8lb and is almost 100% balanced over the bore line. My 308 isn't far off either, both shoot very pleasant without muzzle flip.