I am wondering what if any lighter weight 20" barrels are out there. Something somewhat similar to the criterion hybrid contour. I don't want a pencil barrel, but I don't want excess metal under the handguard. something with just enough shoulder to hold a 750 gas block then hold that all the way back. maybe like .8 all the way back under the handguard. I bought a criterion hybrid its an ok barrel so far I just would have rather it been non chrome lined so it could be a little more accurate. any other options out there??