Guys it is time for a new barrel for the 6br rifle i have and i have a chance to buy a couple different makes of 6mm 8 twist barrels. I was wondering what the general thought is on this 5R rifling in these 6mm bartlein barrels. Im sure they are fine but does this 5R thing offer anything a standard 4 groove krieger doesnt? How about a .236 bore Brux? Those are my three choices. bartlein .237 5R- Krieger .237 4 groove, or a brux .236 4 groove. I would be happy to own any one of these barrels as they all are well made but i was just curious if there is an advantage or anything special about any one of these three barrels listed, currently? Lee