They both do the same thing. I have a clamshell block, but intend to invest in a Reaction Rod to take torsional stress off of the aluminum receiver. Plus the fact it can be used on non-milspec uppers.Ok, want some sound advice here. I am having some thoughts on which to use installing my barrel. I don’t know whether to use the reaction rod to install the barrel because I am reading it puts a lot of stress in one spot. Or should I use the BevBlock to install the barrel and use the reaction rod to install the muzzle brake?
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