i'd highly recommened tha archer barrel, the price depends on what you want, ie, 5r rifling, standard, flutes, profile, etc....
save the money ,go for an archer and spend the extra you would pay on fluting for it....
1 in 10, will be the business, the 1 in 12's just about stabilize the 40g, and even some 39's have bother...
Snap.