Midwest Industries MISTAPSF Buffer Tube with Folding Adaptor Black Steel. The MISTAPSF is a side-folding buffer tube assembly crafted from steel with mag phosphate finish. Features a full-length locking lug for strong lock in folded and unfolded positions, and a steel clamp with extensive surface engagement. The folding mechanism can be configured to fold to the left or right, and its modular design accepts Mil-Spec buffer tubes. When extended, it adds 2.5 inches to the firearm; when folded, it adds 0.75 inches. The complete assembly weighs 8.4 oz. Includes a Midwest Industries buffer tube.