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

Manufactured by Sylvan Arms
SKU: ARH400-L
MPN: ARH400-L
Manufactured by Sylvan Arms
22 Reviews
$177.99

In Stock

Non-FFL orders placed before 3:30pm CST will ship same business day. Non-FFL orders placed after 3:30pm CST will be shipped the next business day. FFL orders will ship within 3 business days once transfer details are provided.

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Details

Details

The Sylvan Arms Gen 4 AR-15 Folding Stock Adapter is compatible with 5.56 and 9mm pattern rifles and allows you to fold your stock for a more compact package for storage. Installation is even easier with the Gen 4, it simply screws into the receiver in place of your buffer tube. From there screw your buffer tube into the folding adapter. A great improvement for the Gen 4 folding adapter is that you now have the ability to install your take-down pin detent and detent spring via a screw port in the adapter itself. The Sylvan Arms Gen 4 AR-15 Folding Stock Adapter offers some other great improvements such as added QD sling attachment points, and a stronger and tighter lock up. The Gen 4 folding stock adapter is still CNC machined from 7075-T6 aluminum with a heavy duty hinge that provide amazing durability. The Sylvan Arms Gen 4 AR-15 Folding Stock Adapter is finished in a hardcoat anodized black for a lifetime of corrosion resistance.

Note: Do not fire when open.

Features:
  • Folds to the left
  • Compatible with all AR platforms
  • Compatible with 9mm
  • CNC machined from 7075-T6 aluminum
  • Hardcoat anodized black
  • Includes a .625 Aluminum Bolt Extension compatible with the JP silent capture spring
  • Includes castle nut wrench
  • Thread specifications: 1-3/16″ X 16
  • Hinge weight: 6.0 oz
  • Limited lifetime warranty

From 9mm conversion blocks, to rifle tools, to stock adapters, Sylvan Arms produces premium, affordable, firearms, gunsmith tools, and accessories.
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Specifications

BrandSylvan Arms
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

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Ratings & Reviews

22 reviews

4.6
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Smooth Operation

by

This adapter my exceptions! The hinge is smooth yet locks up tight when extended, with no play at all. Highly recommend for anyone wanting a folding stock option.

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Best Folding Adapter on the Market!

by

I’ve tried other brands, but Sylvan Arms nailed it with this one. The engineering is precise, and the durability is second to none. Worth every penny!

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Ideal for a Compact Setup!

by

If you need a more compact rifle for transport without sacrificing stability, this is the answer. The left-folding design is smooth, and it stays locked in place when extended.

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Easy to Install & Built to Last!

by

The installation was simple, and the adapter feels incredibly well-made. I’ve taken it to the range multiple times, and it holds up under repeated use. Would buy again!

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Tactical Perfection!

by

This adapter made my AR build so much more versatile. Whether for transport, storage, or tactical use, it works flawlessly. Definitely a must-have for any serious shooter!

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Smooth Folding, No Wobble!

by

One of the best upgrades I’ve made to my rifle. The hinge is smooth, the lockup is tight, and I have no issues with it staying secure during use. A+ product!

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Transforms Your AR for the Better!

by

I wanted a folding stock option that wouldn’t affect performance, and this adapter delivered! It locks in place perfectly, allowing for easy storage while maintaining full functionality.

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Highly Durable & Reliable!

by

The machining on this adapter is outstanding. No wiggle, no misalignment—just a strong, secure fit. I’ve fired hundreds of rounds with it, and it’s holding up great!

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Compact and Tactical!

by

If you want to make your AR more compact without compromising performance, this is the way to go. It folds neatly, locks up solid, and doesn’t add unnecessary weight.

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Perfect Fit & Flawless Operation!

by

I was impressed with how well this adapter integrates with my AR. It installs easily, functions smoothly, and adds so much convenience. Absolutely worth it!

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