I wonder if the Peace River Action block that Brownells sells is the same as the Armorer's Action Block that Model1sales is selling?
Yes, it is. Make sure you always use the insert (plugs in place of bolt carrier) when using the action block. I don't use the mag well block ("lower receiver action block"), but instead have a nice stand from Plastix Plus.
Do not use an action block for removal/installation of muzzle devices (flash hider, muzzle brake, compensator). Use the barrel vise jaws.
Do not use barrel vise jaws for barrel installation.