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Questions & Answers
Will this adaptor fit on my AR pistol cambered in 300blkout? Expert Answer

The Sylvan Arms AR15 Gen 4 Folding Stock Adapter is compatible with an AR15 chambered in 300 Blackout.

by Ethan, Gear Expert, November 12, 2024
what is the total weight of this system? Expert Answer

The Sylvan Arms AR15 Gen 4 Folding Stock Adapter weighs 6 oz.

by Hunter, Gear Expert, September 22, 2023
Customer Reviews
Helpful Positive Review Worth It!! by Cam, December 10, 2024
Great product, function's as it should,easy install, comes with everything you need ,even a scan code for install video!! AWESOME
1/1 found this helpful
Helpful Positive Review Right side fold, awesome by Rickyblaze, Verified Owner, January 27, 2025
I originally bought this to try on my Freedom Ordnance FX-9 SBR. The problem with the FX-9 is that the receiver is shorter than a standard AR lower receiver and makes the use of any folding stock adapter very uncomfortable due to the closer distance ...
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2/2 found this helpful
Helpful Positive Review best version yet by pr, Verified Owner, November 26, 2023
Installation now is super simple. I have both law tactical folders and previous generation sylvian folders. I believe gen 4 sylvian now surpasses all of them. Definitely a great mod to ar. Just makes sense. More rifkes should come out of manu...
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11/11 found this helpful
Helpful Positive Review amazing and sinple to install by Wolf, Verified Owner, February 20, 2025
I installed this on my birgade BM-9. It was an easy install. You will need to remove the bolt weight for it to work properly. I highly recommend this product
1/1 found this helpful
Helpful Positive Review Straightforward Installation and Good Value by LiamRey, Verified Owner, March 4, 2025
I’m pretty new to upgrading my AR, but installing the Sylvan Arms AR-15 Gen 4 Folding Stock Adapter was way easier than I expected. It only took a few minutes, and I didn’t need any special tools or gunsmithing skills. I looked at other folding stock...
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1/1 found this helpful
Helpful Positive Review Folding stock adapter by sylvan arms by ghettyup, Verified Owner, October 28, 2024
Glad I made this purchase. If you’re stuck between this folding stock adapter and the other guys, go ahead and give it a try you won’t be disappointed. I was very hesitant at first but glad I pulled the trigger ( no pun intended) . Great product at a...
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1/1 found this helpful
Read All 56 Reviews

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Our customers have spoken – this is one of the best rated products in the Gun Parts category! See more best rated Gun Parts products
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Product Info for Sylvan Arms AR15 & AR9 Gen 4 Folding Stock Adapter

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.image

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.

  • 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
  • If your bolt carrier group is causing the bolt extension to come up short contact us for a conversion. 
  • Includes all items needed to install.

Specifications for Sylvan Arms AR15 & AR9 Gen 4 Folding Stock Adapter:

Manufacturer: Sylvan Arms
Condition: New
Color: Black
Gun Make: AR Platform
Fabric/Material: 7075 Aluminum
Threads per Inch: 1-3/16x16
Weight: 6 oz

Features of Sylvan Arms AR15 Gen 4 Folding Stock Adapter

  • 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 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.
  • Simply screw on, fold and carry!

Package Contents:

  • Sylvan Arms AR15 Gen 4 Folding Stock Adapter
  • .625 Aluminum Bolt Extension
  • Castle nut wrench

Sylvan Arms AR15 & AR9 Gen 4 Folding Stock Adapter Orderable Models

List of Orderable Models

Sylvan Arms AR15 & AR9 Folding Stock Adapter, Gen 4, Left Fold, Black, ARH400-L , MPN: ARH400-L , UPC: 811313033353 , Code: 46S-STA-FSTA-ARH400-L
Sylvan Arms AR15 & AR9 Folding Stock Adapter, Gen 4, Right Fold, Black, ARH400-R , MPN: ARH400-R , UPC: 811313033360 , Code: 46S-STA-FSTA-ARH400-R

Sylvan Arms AR15 & AR9 Gen 4 Folding Stock Adapter Unavailable & Discontinued Models

List of Unorderable Models

DEMO, Sylvan Arms AR15 Folding Stock Adapter, Gen 4, Right Fold, Black, ARH400-R , MPN: ARH400-R-DEMO , Code: 46S-STA-FSTA-ARH400-R-DEMO
USED Sylvan Arms AR15 Folding Stock Adapter, Gen 4, Right Fold, Black, ARH400-R, EDEMO1, Used, Condition Fair , MPN: ARH400-R-EDEMO1 , Code: 46S-STA-FSTA-ARH400-R-EDEMO1
USED Sylvan Arms AR15 Folding Stock Adapter, Gen 4, Left Fold, Black, ARH400-L, EDEMO1, Condition Fair, Other , MPN: ARH400-L-EDEMO1 , Code: 46S-STA-FSTA-ARH400-L-EDEMO-OT-D
USED, Sylvan Arms AR15 & AR9 Folding Stock Adapter, Gen 4, Right Fold, Black, ARH400-R , MPN: ARH400-R-EDEMO , Code: 46S-STA-FSTA-ARH400-R-EDEMO-DF-F
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