Sylvan Arms AR-15 & AR-9 Folding Stock Adapter - Gen 4 - Left Folding - ARH400-L

Transform your AR-15 or AR-9 into a compact powerhouse with the Sylvan Arms AR-15 & AR-9 Folding Stock Adapter – Gen 4 – Left Folding. Designed for shooters who demand portability without sacrificing reliability, this adapter lets you fold your stock effortlessly, slashing your rifle’s length for seamless storage, travel, and discreet carry. Whether you’re heading to the range, prepping for a hunt, or building a go-anywhere tactical setup, this Gen 4 innovation delivers the flexibility you need in a rugged, American-made package.

Key Features

• Left-Side Folding Design: Folds to the left side, away from the ejection port and charging handle, ensuring unobstructed operation and a clean profile for right-handed shooters.
• Minimal Gap Construction: The Gen 4 adapter hugs the lower receiver closely, minimizing any spacing issues and maintaining a sleek, integrated look when extended.
• Easy One-Piece Installation: No need to disassemble your build—simply screw it on using the included tools for a quick setup in minutes.
• Included Bolt Extension: Comes with a .625″ aluminum bolt extension to ensure smooth cycling with standard AR-15 BCGs, plus compatibility tweaks for select AR-9 configurations.
• Corrosion-Resistant Build: Crafted from durable 7075 billet aluminum for lightweight strength that withstands harsh environments.

Technical Specifications

• Weight: 6.0 ounces—keeps your rifle balanced and agile.
• Material: CNC-machined 7075 billet aluminum.
• Thread Pattern: Standard 1-3/16” x 16 tpi for broad compatibility.
• Folding Direction: Left (as oriented with barrel downrange).
• Dimensions (Packaged): Length: 8 inches, Width: 5.9 inches, Height: 4.3 inches.

Why Choose the Sylvan Arms Gen 4 Folding Adapter?

Address common challenges like bulky storage and transport hassles head-on. This adapter solves the pain of maneuvering long rifles in tight spaces or vehicles, while preserving full functionality when deployed. Unlike bulkier alternatives, its lightweight design adds minimal heft, enhancing maneuverability for home defense, backpacking, or competitive shooting. Users appreciate its rock-solid lockup in both folded and extended positions, preventing unwanted movement and ensuring confidence in every fold. Perfect for AR builders seeking an affordable upgrade that boosts versatility without compromising on quality or ease of use.

Frequently Asked Questions

Q: Is this adapter compatible with my AR-9 build?
A: Yes, it works with most AR-15 platforms (.223/5.56, 300 Blackout, up to .308) and select AR-9s using standard-sized BCGs. The included bolt extension accommodates .625″ ID carriers; consult compatibility for non-standard 9mm BCGs.

Q: How easy is the installation process?
A: Installation is straightforward and tool-inclusive—no full disassembly required. The provided castle nut wrench and instructions allow for a secure fit in under 10 minutes.

Q: Does the folding direction affect shooting ergonomics?
A: The left-folding option is ideal for right-handed users, as it avoids interference with the charging handle and brass ejection, promoting smooth handling.

Elevate your AR setup today with the Sylvan Arms Gen 4 Left Folding Stock Adapter. Compact, reliable, and ready for action—order now and experience the difference in portability and performance.