I have a Rock River A2 upper with a 20" heavy barrel, it is used for range trips, maybe occasional coyote hunting, semi auto only. I would like to lighten it up some and am going to send it to Adco but had a couple questions. I was thinking of contouring under the handguard to the USGO / Govt. profile. Would there be any reason not to remove that much material, to leave it more of a medium contour? I also thought about fluting under the handguard - how would that compare (weight wise) to contouring? Any other considerations between contouring and fluting? Thanks for any info / suggestions you can offer.