Description
The Sylvan Arms SA5 Pro Gen.5 is the folding stock adapter you reach for when you want your AR to shrink down for a truck, a pack, or a discreet case without giving up a full-size rifle at the range. This is the right-fold version, which means the stock swings toward the ejection port side when your build is pointed downrange. It threads on with a standard 1-3/16 x 16 pattern and works with standard AR-15 bolt carrier groups right out of the box, no extra parts required.
What Sets the SA5 Pro Apart
This is Sylvan Arms' fifth-generation design, and the build quality shows. It's CNC-machined in the USA from 4140 steel and comes in at right around 9.4 ounces, so you get serious durability without hanging a boat anchor off the back of your receiver. Sylvan rates it as roughly 250% stronger than their Gen 4 adapter, and it's built to be user-serviceable, so replacement pins, springs, and screws are available if you ever wear one out. The unit sits closer to the lower than older designs, which trims the folded length and closes up the gaps that used to bug people about side folders.
Fitting the SA5 Pro to Your Build
Installation is about as simple as it gets. You remove your existing buffer tube, thread the adapter onto the lower, and reattach your stock or brace setup. Most folks have it done in under five minutes with the included wrench. It plays nice with .223/5.56, .308, and 300 Blackout builds, and most 9mm ARs will run it using the included bolt extension after pulling the pin and weight from the back of a standard-sized 5/8 ID carrier.
Keep in mind this is a right-fold specific unit, so if you'd rather have the stock tuck away on the non-ejection side, grab the left-fold version instead. For anyone building a compact truck gun, a travel setup, or just wanting a rifle that stows small, the SA5 Pro is a clean, tough answer that installs fast and stays put.
Key Specifications
- Manufacturer: Sylvan Arms
- Manufacturer Part Number: SA5P-R
- Model: Gen.5 (SA5 Pro)
- UPC: 811313033384
- Fold Direction: Right Fold
- Material: 4140 Steel, CNC-machined
- Country of Origin: Made in USA
- Color: Black
- Weight: 9.4 oz
- Thread Pattern: 1-3/16" x 16
- Compatibility: .223/5.56, .308, 300 Blackout, most 9mm ARs
- Install Time: Under 5 minutes
What’s Included
- SA5 Pro Gen.5 right-fold adapter
- Bolt extension
- Install wrench
- All hardware needed to install
Frequently Asked Questions
Which way does the SA5 Pro Right Fold swing?
With your rifle pointed downrange, the right-fold model folds the stock toward the ejection port side. If you'd rather have it fold to the opposite side, Sylvan Arms offers a matching left-fold version. Pick whichever keeps your controls and sight line clear for how you carry and store the rifle.
Is the SA5 Pro hard to install?
Not at all. You remove your buffer tube, thread the adapter onto your lower, and reattach your stock or brace, and the included wrench handles the tightening. Most people have it done in under five minutes with no gunsmithing required.
Will the SA5 Pro work with my caliber and bolt carrier group?
It runs on standard AR-15 bolt carrier groups with no extra parts and is compatible with .223/5.56, .308, and 300 Blackout builds. Most 9mm ARs will work using the included bolt extension after removing the pin and weight from a standard 5/8 ID carrier. Note that it does not fit Tippmann 22 or LWRC pistols.
How much does the SA5 Pro weigh and what's it made of?
It's CNC-machined in the USA from 4140 steel and weighs about 9.4 ounces. Sylvan Arms rates it as roughly 250% stronger than the Gen 4 design, and it's user-serviceable so you can replace the internal pin, spring, and screw down the road.




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