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New from Midwest Industries, their Side Folder with Mil-Spec buffer tube.  Side folder can be configured for either right or left folding.    
    

• 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
• 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
• 100% made in the USA