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Sylvan Arms

Sylvan Arms Folding Stock Adapter for AR-15s and 9mm | ARH300

Product Code : 852237007365

Mfg Item #: ARH300

The Sylvan Arms Folding Stock Adapter allows you to fold your stock and significantly reduce the length of your rifle for easy stow and travel. Specifically designed for gas piston and direct impingement systems 5.56, .223, .308 systems, as well as nearly all 9MM AR platforms. It has standard 1-3/16” x 16 thread and does not require any additional parts to be used with standard BC 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 required; only a standard armorer’s wrench. The product does not need to be disassembled in order to install it on to your rifle/pistol. Adds nothing to length of pull. Simply screw on, fold, and carry!


  • Fit: 556/223, .308, most 9mm
  • Coating: Hard Coat Black Anodized
  • Material: 7075 Billet Aluminum
  • Dimensions: 3 11/16 inches
  • Length: 1.3 inches
  • Warranty: Limited Lifetime Warranty
  • Weight: 6.0 ounces
  • Thread Specification: Standard 1-3/16” x 16 thread


  • SKU: ARH300
  • UPC: 852237007365
  • MPN: ARH300
  • Manufacturer: Sylvan Arms
  • Model: ARH300 AR Side Folding Unit
  • Condition: New
  • Material: Aluminum
  • Fits: AR-10, AR-15

**Please Note**
9mm bolt carriers standard sizing (.625) can use the bolt extension included, after removing the pin and weight from the bolt carrier. 17/32 .531 bolt extension for smaller bolt carriers are available upon request. If your PSA bolt carrier is causing the bolt extension to come up short contact us for help. Does NOT work with Silent Capture Buffer Springs.
-Does NOT work with JP Enterprise Buffer Systems.

FinishBlack Anodized

Determined at checkout.