SKU: CSSI|IQARH400L

Sylvan Arms AR15 & AR9 Folding Stock Adapter Gen. 4 Left Fold

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.

The Gen 4 AR Folding Adapter sits closer to your AR lower to reduce the length and any gaps. Turn your rifle into a foldable AR providing a compact rifle setup.

The direction of the fold is orientated to the direction as if your build was pointed down range. On a standard build Folding to the RIGHT folds toward the ejection port. Folding to the LEFT folds off to the side with out the ejection port. Our previous folders have folded off to the LEFT

Features:

  • Now Available as a left or right fold pick the best AR side folder setup to fit your needs.
  • Compatible with most AR15
  • Standard 1-3/16” x 16 thread and does not require any additional parts to be used with standard AR15 Bolt Carrier Groups.
  • CNC-machined in the USA from 7075 Billet Aluminum making it uniquely lightweight and corrosion-resistant. This assembly weighs only 6.0 ounces.
  • The included wrench makes for a quick and easy install. The product does not need to be disassembled in order to install it onto your rifle/pistol.

Product Details: 

  • Includes a .625 Aluminum Bolt Extension
  • Includes a castle nut wrench
  • Fit: Platforms .223/5.56 to .308 & Most 9mm
  • Does NOT work with Tippmann 22 or LWRC Pistols
  • Some 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
  • Compatible with your 300 Blackout AR’s for an effortless 300 Blackout Folding Stock Setup.
  • Includes all items needed to install.
SKU CSSI|IQARH400L Category

Sylvan Arms AR15 & AR9 Folding Stock Adapter Gen. 4 Left Fold

$177.99

41 in stock

FAQ

BJ Firearms LLC is a federally licensed firearms business focused on providing quality firearms, accessories, and related services while promoting responsible ownership, education, and community engagement.

The company was founded to serve firearm enthusiasts with knowledgeable service, real-world experience, and a commitment to professionalism and safety.

We focus on real experience, personalized service, hands-on product knowledge, and community involvement — not just sales. Our goal is to help customers make informed decisions and feel confident with their equipment.

Yes. We operate as a federally licensed firearms dealer (FFL), following all applicable federal, state, and local regulations.

Yes. We partner with trusted suppliers to provide quality products and reliable sourcing.

Yes. We partner with content creators and industry professionals to provide real-world insights and experiences.

We work with everyone — from first-time buyers to experienced enthusiasts. Education and guidance are a big part of what we do.

We offer firearms, accessories, gear, and related equipment depending on availability and customer needs.

Yes. We help customers evaluate their needs, experience level, and intended use to find the right fit.

Yes. Depending on the request, we can help source specific products or assist with custom configurations.

Yes. We actively engage in hands-on experiences, demonstrations, and community-related firearm activities when possible.

Yes. We support content that helps people learn about equipment, safety, and responsible firearm ownership.

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Customer Reviews

“Outstanding customer service.” I had a lot of questions before buying, and they walked me through everything without pressure. Super knowledgeable and easy to work with. You can tell they actually care about their customers.
Verified Customer
“Best experience I’ve had buying gear.” Professional, responsive, and honest. They helped me choose exactly what I needed without overselling anything. I’ll definitely be coming back.
Verified Customer
“Great people, great service.” Very down-to-earth and easy to talk to. They explain things clearly and make sure you understand your options. Highly recommend, especially if you’re new.
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