Sylvan Arms SA5 Pro Folding Stock Adapter Gen 5 Left

The Sylvan Arms SA5 Pro Gen. 5 folding stock adapter allows an AR-style platform to fold at the receiver hinge, reducing overall length for more compact storage and transport. This listing is for the left-fold configuration, which folds to the left side when the rifle is held in a standard orientation. The adapter is CNC-machined in the USA from 4140 steel and is supplied with the bolt extension and installation hardware needed for installation on compatible platforms. It is designed to work with standard AR bolt carrier groups and common AR cartridges where compatibility is indicated.

Key Specifications

• The adapter model is SA5 Pro Gen. 5 — Left Fold.
• Constructed from 4140 Steel and CNC-machined in the USA.
• Uses a standard 1-3/16 x 16 thread interface for compatibility with standard AR bolt carrier groups.
• Includes a 1045 Steel bolt extension as part of the kit.
• Includes a castle nut wrench and the necessary installation hardware.
• Fitment listed for .223/5.56 to .308 platforms and most 9mm bolt carrier assemblies.
• Does not work with Tippmann 22 or LWRC pistols; these platforms are explicitly excluded.
• Compatible with 300 Blackout platforms where standard BCG interface dimensions are used.
• The fold orientation is described relative to a standard build; this unit is the left-fold option.
• All included parts required for installation are provided with the adapter.

The SA5 Pro Gen. 5 left-fold adapter offers a robust, service-oriented solution for shooters who need a closer-fitting folding hinge for their AR-style platforms. Its steel construction, included bolt extension, and straightforward installation make it a practical choice for builders and technicians seeking a durable folding option that retains standard BCG compatibility where applicable.