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AR15 and AR9 Folding Stock Adapter Gen. 3 – The Sylvan Arms Folding Stock Adapter allows you to fold your stock and significantly reduce the length of your rifle for easy stowing and travel.

Specifically designed for gas piston and direct impingement systems .223 / 5.56 to .308 systems, it has standard 1-3/16” x 16 thread and does not require any additional parts to be used with standard Bolt Carrier Groups.

It is CNC-machined in the USA from 7075 Billet Aluminum, making it uniquely lightweight and corrosion-resistant. This assembly weighs only 6.0 ounces. No special tools are required; only a standard armorer’s wrench. The product does not need to be disassembled in order to install it onto your rifle/pistol.

Simply screw on, fold, and carry!

Product Details

  • Includes standard .625 Aluminum Bolt Extension
  • Fit: Platforms .223/5.56 to .308 & Most 9mm
  • Does NOT work with Tippmann 22 or LWRC Pistols
  • 9mm bolt carriers with standard sizing, 5/8 ID (.625) can use the included bolt extension after removing the pin and weight from the back of the BCG
  • For smaller diameter BCG’s, we have 17/32 .531 bolt extensions available here
  • Now Compatible with Silent Capture Buffer Springs if you use our Silent Capture Bolt Extension (Does NOT work with Armaspec Silent Capture)
  • 300 blk (blackout) compatible
  • Adds 2 inches to the length of pull
  • If your bolt carrier group is causing the bolt extension to come up short contact us for a conversion
  • We recommend purchasing a Buffer Retaining Nut to replace the pin.


  • Finish: Hard Coat Black Anodized
  • Material: 7075 CNC-machined billet Aluminum
  • Thread specifications: 1-3/16″ X 16
  • Hinge dimensions: 3 11/16 inches
  • Hinge Weight: 6.0 oz. Bolt Extension: 1.1 oz.
  • Hinge length: 1.3 inches
  • Warranty: limited lifetime

Designed, built, and assembled in the USA. Please note that some colors may vary slightly from images.





AR15, AR9


Sylvan Arms


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Sylvan Arms AR15 & AR9 Folding Stock Adapter Gen. 3

Our Price:

Sylvan Arms AR15 & AR9 Folding Stock Adapter Gen. 3 $179.99
  • MSRP$179.99
  • MPNARH300
  • UPC852237007365

Total in stock: 0

Available on backorder

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5004 State Highway 74 Cape Girardeau, MO 63701
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