The Midwest Industries Side Folder with Light Weight Stock is for use with firearms that have a picatinny attachment. The side folder can be adjusted to fold wither to the right or left. A modular design can accommodate different stock attachments and includes 3 QD anti-rotation swivel sockets. 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 engagementAdds 8.75 inches to firearm length in the open positionAdds 0.75 inches to the firearm in the folded positionNote: This product is NOT for use with firearms with buffer assemblies