Sylvan Arms AR-15 Folding Stock Adapter - Gen 3

Manufactured by Sylvan Arms
Manufactured by Sylvan Arms
34 Reviews
$119.99 $149.99

In Stock

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The Sylvan Arms Gen 3 AR-15 Folding Stock Adapter is compatible with 5.56 and .308 pattern rifles and allows you to fold your stock for a more compact package for storage. It simply screws into the receiver extension slot where your buffer tube would and then you screw your buffer tube into the stock adapter. The gen 3 folding stock adapter is CNC machined from 7075-T6 aluminum with a heavy duty hinge and hardcoat anodized black for long term corrosion resistance.

Note: Do not fire when open.

  • Compatible with all AR platforms
  • Compatible with 9mm with Sylvan Arms 9mm bolt conversion (not included)
  • CNC machined from 7075-T6 aluminum
  • Hardcoat anodized black
  • Includes buffer extension
  • Includes castle nut and end plate
  • Thread specifications: 1-3/16″ X 16
  • Hinge dimensions: 3 11/16 inches
  • Hinge weight: 6.0 oz, BC – Extension 2.2 oz
  • Hinge length: 1.3 inches
  • 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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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

Ratings & Reviews

34 reviews


Great addition to any AR pistol


I have the Gen3 installed on two different AR pistols. One 10.5" 5.56 and another on a 8" PSA AR9. Both have the SB-4 braces installed and when folded they lay flat and are stay in place. The PSA AR9 required removal of the weight installed in the BCG and a extension plug with larger diameter O rings which Sylvan sent out to me at no charge. Adds about 2" to the length of pull which I prefer. Well made and functions great I highly recommend.

Works great


Worked great on Foxtrot Mike's 9mm AR. Easy install. No issues. Very happy with it. Slightly on the heavy side, but it's well made.

Sylvan Arms AR-15 Folding Stock Adapter

by -

First, let me say that this is a great product it is only getting four stars because there is definitely room for improvement. I would buy it again.

Works as intended, price to value is excellent, installation is simple. I am using it on a 7.5" AR pistol and it allows me to carry it in a normal sized backpack.

I am using this with a SBA4, one of their heavier braces. Due to the weight, if I rotate the AR towards the folded stock, it falls/swings down. Not a huge deal, probably would not be an issue with a lighter brace/stock.

The castle nut included with it is not the best quality. I used a standard armorer wrench and the recommended torque and it still scuffed up the castle nut.

The adapter does not sit flush to the base plate. This is completely an aesthetic issue for me, it just looks slightly awkward having the base plate, a space, then the adapter.

Great price compared to others


compared to others its price is amazing and I used it on a custom build 357 sig AR that i can now carry in a small backpack thanks to this folding adapter

First day at the range.


preformed as expected, great price, great deal, and a great place for what you need.

Awesome purchase


Used this for my AR pistol with SBA3 brace. it added about 2 inches to length of pull. However, if you use the SB tactical limiters, adding 2 limiting tabs will put it at exactly 13.5 inches. When in the folded position, will not move unless you shake it. clicks nicely into place when folding as well. can adjust retention on the hinge using hex key. added some weight, but worth it.

So far so good


Purchased this and so far 300 rounds and no problems. Supposed to have fixed the problems the gen 1 & 2 and as of this point ,have no complaints.

Be careful of the springs.


My opinion is the instructions are harder to follow then just putting it together.Pretty heavy for a chunk of aluminum.

Solid choice, cool and functional


When installed and wrenched down with the correct tools, it works great. Watch the YouTube video on the install. Would buy again.

Works as it should


This folder is very sturdy and well made, also functions flawlessly. Will be purchasing more for other builds.