Heavy-duty side-folding mechanism constructed from 4140 steel. Can be configured to right or left folding. Modular design can accommodate different stock attachments. End user is responsible for any ATF requirements while using pistol brace Specifications for Midwest Industries Side Folder With MI Stock Tube: Manufacturer: Midwest Industries Color: Black Fabric/Material: Aluminum Gun Model: AR-15 Condition: New Country of Origin: USA Gun Type: Rifle Features of Midwest Industries Mi Side Folder With Mi Stock Tube Picatinny Full-length locking lug for maximum strength Solid positive lock up in both positions Steel clamp with large surface engagement Features a Mil-Spec diameter aluminum stock tube that is hard coat anodized Stock tube features waterproof storage compartment Adds 7.375 inches to overall firearm length Adds 0.75 inches to the firearm in the folded position Complete assembly weight: 13.5 oz. Steel parts are mag phosphate finished Package Contents: Midwest Industries Mi Side Folder With Mi Stock Tube Picatinny