I bought a 10/22 barrel on CGN about 2 years back.The fellow had 5 or so of these fluted bull barrels for sale that were factory seconds due to poor bluing.Anyways....I bought one and never used it and would like to sell it.I don't remember which manufacturer it was,Green Mountain or Butler Creek.The barrel looks like a G.M model as per the web site but I'd like to know if there are any distinguishing features between the two?Or does someone else have a barrel from this sale and can refresh my memory.Thanks.