Matador Arms Sidewinder Folding Stock Adapter

Matador Arms Sidewinder Folding Stock Adapter

The Matador Arms Sidewinder Folding Stock Adapter is a rugged and versatile solution for shooters who need a compact profile without sacrificing durability or performance. Designed with AR-style platforms in mind, this folding adapter provides rock-solid lockup when extended, ensuring zero wiggle and maximum reliability. Whether you’re building a compact AR-15, AR-9, or using alternative pistol-caliber systems, the Sidewinder delivers dependable folding capability without compromise.

This adapter is compatible with a wide range of platforms that accept AR buffer tube threads, including systems like the Brownells^® BRN™ series, Scorpion^®, Vector™, and certain chassis-based firearms. It’s especially well-suited for pistol systems and builds where a buffer system is not required. However, it will not function with traditional AR-15 or AR-10 rifles that rely on a buffer tube for cycling. For those building AK-style or blowback setups, the Sidewinder is an ideal upgrade that adds folding functionality without compromising performance.

Constructed from 4175 aluminum, the Matador Arms Sidewinder Folding Stock Adapter is built to take abuse. The hinge is reinforced for repeated use and locks open with absolute stability. Thousands of Sidewinders are already in use by enthusiasts, OEM partners, and professional users, and Matador Arms backs the product with a full lifetime warranty. If it ever breaks due to a manufacturer’s defect or from regular use, it will be replaced—no questions asked.

Note that this product does not include a stock adapter. Depending on your host firearm, you may or may not require one for installation. Always verify your system’s compatibility before purchase. For a perfect match, pair the Sidewinder with the Matador Arms MAT-9 Complete Upper Receiver for an ultra-compact PCC build.

• Compatible with Scorpion^®, Vector™, BRN™, MAT-9, and chassis systems
• Accepts firearms with AR buffer tube thread patterns (non-buffered systems only)
• Constructed from durable 4175 aluminum
• Rock-solid lockup with no wiggle or play when extended
• Lightweight, low-profile design ideal for compact builds
• Lifetime warranty from Matador Arms

The Matador Arms Sidewinder Folding Stock Adapter is the ideal solution for users who demand reliable folding function, structural strength, and adaptable compatibility across various firearms platforms.