I only know of White Oak from reading ,I know of DPMS first hand,you say WOA is $50 more and has Wilson barrels, well the good news is DPMS, also has Wilson air guage premium barrels and when they run out of stock,they alternate with Lothar Walther premium barrels .DPMS CMP barrels have an extremely tight chamber, the bolt will not fully close on a SAAMI GO guage,I had a super bull in 1in9 twist 24in. and it shot 69gr smk at a100yd, .153 in. group.I now have a 20in. 1in8 twist ,CMP and am loading 77gr smk and have already surpased BlackHills groups in their Mk262Mod1 as they have advertised of .60 at 100yd now the choice is yours.six of one half dozen of another,and $50 bucks in between!,you can call DPMS an spec your gun out your way with all the bells and whistles,if you arent doing it your self! Joe is great over there