AR-15 / AR-9 – Folding Stock Adapter – Gen 4 – Black - Left or Right choice
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
The Sylvan Arms Gen 4 Folding Stock Adapter gives AR-pattern rifles and pistols a more compact footprint for storage, transport, and tight-space handling without forcing you into a dedicated folding lower. This Gen 4 version sits closer to the lower to reduce gap and keep the setup cleaner when locked open.
Verified variants for this card are Left Fold and Right Fold, both in black. Fold direction is oriented as if the rifle is pointed downrange: right-fold goes toward the ejection port, left-fold goes away from it.
Fitment
- Fits most AR-15 platforms
- Compatible with standard 1-3/16" x 16 receiver extension threads
- Works with AR calibers/platforms from .223/5.56 up to .308, plus most 9mm AR setups
- Compatible with standard AR-15 bolt carrier groups
- Includes a .625 aluminum bolt extension for compatible setups
- Can be used on 300 Blackout AR builds
Does NOT fit
- Does not work with Tippmann .22
- Does not work with LWRC pistols
- Some 9mm bolt carriers may require specific compatibility checks before use
What it does
This adapter lets your AR-pattern rifle or pistol fold at the rear, cutting overall length for easier stowage and transport while retaining a standard rear extension setup when deployed.
Why it’s worth it
For builders who want a more compact AR without jumping to a totally different platform, this is a proven shortcut. The Gen 4 design trims excess gap, keeps weight reasonable, and gives you the choice of left or right folding depending on how you run the gun.
Specs
- Manufacturer: Sylvan Arms
- Product type: Folding stock adapter
- Generation: Gen 4
- Platform: AR-15 / AR-9 / most AR-pattern rifles and pistols
- Thread pattern: Standard 1-3/16" x 16
- Material: CNC-machined 7075 billet aluminum
- Finish: Black
- Weight: 6.0 oz
- Available variants: Left Fold, Right Fold
- Made in the USA
What’s included
- Sylvan Arms Gen 4 folding stock adapter
- .625 aluminum bolt extension
- Castle nut wrench
- Required installation components
Tools needed
The included wrench handles the main install, but basic armorer tools and common sense still help. Verify your setup before you crank on anything like a gorilla with a credit score.
Install notes
Sylvan states this installs without disassembling the unit itself and is meant to screw on for a quick setup. For some 9mm bolt carrier configurations, compatibility should be confirmed before live use. After install, verify lockup, clearance, cycling, and safe function before firing.
Verify before you buy
Verify your AR uses standard 1-3/16" x 16 rear threads, confirm your platform is not a Tippmann .22 or LWRC pistol, and choose the correct fold direction for how you want the gun to store and deploy. Right fold goes toward the ejection port. Left fold goes away from it.
⚠ Trademark & Compatibility Disclaimer
IronKells Armory LLC is not affiliated with, endorsed by, or sponsored by any manufacturer mentioned. All trademarks are the property of their respective owners and are used only to identify compatibility or fitment.
⚠ Install & Compatibility Disclaimer
Installation should be performed by a qualified armorer or gunsmith. Improper installation, modification, or use may affect firearm safety and reliability. Buyer is responsible for verifying compatibility, performing proper function testing, and ensuring safe operation.
