12-03-2014, 04:20 AM
LRRPF52, being new to this building, I am having trouble envisioning how they are doing that. Is it happening when they remove the barrel nut or flash hider? Since I have billet upper I guess you are saying that a couple of pieces of butcher board and sandwich sideways is best. I am just worried about putting too much pressure and bending the upper with this type of set up.

