How much of a difference in accuracy can one expect between a Green Mountain barrel and,say one made by Colerain or Rice? Is the Colerain really worth the extra seventy bucks and the Rice worth the extra one hundred and seventy? I realise that the G.M. barrel requires more of a break in period but once it's been fired a hundred times or so what's the accuracy like with one? I'm putting together the parts for a new build and trying to decide which barrel to get. Accuracy is really important to me (as I'm sure it is for most people), but if there is going to be scarcely a difference between a broken-in G.M. barrel and one more expensive then I may as well go with the cheaper barrel.