For muzzle devices, I use barrel vice blocks. For barrel nut or handguard install/removal, I use the reaction rod.
No issues with either. Before buying the barrel vice blocks, I used the RR on more than one occasion, and had no issues. As IG said above, you have to be smarter than the equipment you are using.
This barrel vice block from brownells has blue rubber that leaves little to no marring on the barrel.
http://www.brownells.com/gunsmith-to...prod12799.aspx

