To manufacture our button rifled barrels, stock metal is cut down and drilled with a mandrill with reverse rifling which cuts out the lands and grooves of the rifling.
This mandrill is pushed through the barrel. This process is used for our Custom Shop Model 40-X and Model 40-XR rifles, the Model 504, Model 597, and Model 710 rifles.
Our hammer forged barrels start with cylindrical metal which is hammered around the mandrill. Although this process somewhat stresses the metal, the barrel is heat treated to relieve this stress. This process is used for our standard production rifles & shotguns.