Sylvan Arms Sa5P-R Sa5 Folding Stock Adaptor 4140 Steel Black

The Sylvan Arms SA5 folding stock adaptor transforms your AR into a compact, packable rifle without sacrificing functionality. Built from 4140 steel and engineered with a lower profile design, this adapter lets you collapse your stock significantly—ideal for hunters, overlanders, and shooters who need their rifle to fit tight spaces, vehicle storage, or a pack. Unlike traditional folders that sit higher on the receiver, the SA5P-R sits closer to your lower to minimize gaps and overall collapsed length, so your setup stays as compact as possible when folded.

Installation is genuinely simple: screw it on, fold, and go. No disassembly required. Sylvan includes a castle nut wrench for quick setup, and the adapter works with standard AR15 stocks and most bolt carrier groups right out of the box. The fold direction is calibrated to your shooting orientation—right-fold models orient toward the ejection port on a standard setup, left-fold models away from it—so you can choose which side works best for your platform and carry method.

Machined in the USA and weighing just 9.4 ounces, the SA5P-R is built tough without adding bulk. It's compatible with .223/5.56, .308, 9mm, and 300 Blackout platforms. The included 1045 steel bolt extension adapts the folder to your specific bolt carrier group, and Sylvan backs the engineering with real customer support if your BCG needs adjustment for a perfect fit.

Key Features

• Compact folding design reduces overall rifle length for storage and transport
• Low-profile adapter sits closer to the receiver, minimizing gaps
• CNC-machined 4140 steel construction—USA-made durability
• No disassembly needed for installation
• Includes castle nut wrench and 1045 steel bolt extension
• Works with standard 1-3/16" x 16 thread AR15 stocks
• Weighs only 9.4 ounces

Specifications

Frequently Asked Questions

What AR platforms does the SA5P-R work with?

The SA5P-R is compatible with .223/5.56, .308, 9mm, and 300 Blackout AR platforms. It threads onto standard 1-3/16" x 16 AR15 stocks and works with most bolt carrier groups. Some 9mm carriers with standard 5/8 ID sizing can use the included bolt extension after minor BCG modification.

Do I need tools or special parts to install it?

No. Installation requires no disassembly of your rifle or bolt carrier group. Simply screw the adapter onto your stock and fold. An included castle nut wrench makes the job quick. The adapter comes with a 1045 steel bolt extension to adapt to your specific BCG, and Sylvan provides support if your carrier needs adjustment for optimal fit.

How much does the rifle shorten when folded?

We don't have the exact collapsed length in our specs, but the SA5P-R is designed with a low-profile receiver sit to minimize overall length compared to standard folders. For precise measurements, contact Sylvan Arms directly.

Can I use this with my 300 Blackout build?

Yes. The SA5P-R is compatible with 300 Blackout AR platforms and provides a compact folding setup for that caliber.