Buy it @ Rainier (Click Here)

"This is a great choice for use on any AK built off our MB47 receiver or our Heatseeker chassis.  It is minimalist in design (3.4 oz) and gives you the fold-left option you are looking for." - JSharps 

From SB Tactical:

NOT COMPATIBLE WITH AR PLATFORMS

The BTFA Buffer Tube Folding Adapter is designed for use with all buffer tube receptacles.

Features & Specifications:

• Low-profile design
• Reversible for right or left side-folding
• Locks in both the open and closed positions
• Made of 6061 type III anodized aluminum
• Designed for use with all buffer tube receptacles
• NOT compatible with AR platforms
• Weight: 3.4 oz
• OAL: 1.5” (adds only 1.1” when installed)