The Midwest Industries Side Folder with Buffer Tube Adapter is for use with firearms that have a picatinny attachment. The side folder can be adjusted to fold either to the right or left. A modular design can accommodate different stock assemblies. FeaturesHeavy-duty side-folding mechanism constructed from 4140 steelFull-length locking lug for maximum strengthSolid positive lock up in both positionsSteel clamp with large surface engagementAllows attachment of Mil-Spec buffer tubeAdds 2.5 inches to firearm length in the open positionAdds 0.75 inches to firearm length in the folded position