Great little piece, but doesn't work for everything. - Anarchy Outdoors Tactical -Folding- Bolt Carrier Extension JP Law

Let me start off by saying it is nicely made and isn't a bad product, however depending on what you're running will change how well it will work if at all; Personally I currently have the Sylvan Arms Folding Stock Adapter and the Armaspec SMB buffer system, this extension is way too short to allow the BCG to go all the way into battery and effectively forcing me to use the provided extension by Sylvan Arms and a regular buffer and spring system.