I have a model 111 in 300 win mag with a factory stock and factory DBM. Im wanting to upgrade to a tactical style stock. Is my factory magazine considered a "centerfeed" or a "staggered feed". I am confused because the shells are staggered when loaded into magazine, but from what i have researched, the stagger feed was on older rifles. The letter on my serial # is a "G" so if i am correct the rifle was made after 2002. Any help would be greatly appreciated,thanks