Heavy-duty side-folding mechanism constructed from 4140 steel; Full-length locking lug for maximum strength; Solid positive lock up in both positions; Steel clamp with large surface engagement; Can be configured to right or left folding; Modular design can accommodate different stock attachments; Allows attachment of Mil-Spec buffer tube; Steel parts are mag phosphate finished; Adds 2.5 inches to firearm length in the open position; Adds 0.75 inches to firearm length in the folded position