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"This is a great choice for use on any AK built off our MB47 receiver or our Heatseeker chassis.  It is minimalist in design and gives you the fold-left option you are looking for." - JSharps 

From Hera Arms:

The SFU, Side Folding Unit, has gained its popularity through our Triarii pistol system and through various agency and customer requests; the Hera Team has now engineered a slim line folding adapter.  Using high speed CNC milling we are able to offer a sleek and user friendly adapter for various systems that use the AR15 style buffer tube assembly.

Cannot be used in AR15 platforms or any weapon with recoil system extending into stock>

Technical Specs:

• Weighs 6oz - 2 1/8" overall length in closed position
• Accepts any standard AR-style buffer tube
• Includes set screw for buffer tube alignment
• Simple and easy to install
• Made in Germany