Stock | Brace Folding Mech

This page allows you to purchase the JMac Customs folding mechanism à la carte. To buy it as part of a complete build, please visit our Stock and Arm Bar pages.

JMac Customs’™ best-selling 4140 heat treated steel folding mechanism with a QPQ Black Nitride Finish is designed to mount JMac and SIG style stocks/braces to virtually any platform. Built with strength and durability in mind, this folding mech is engineered for long-lasting performance. It comes ready to mount, offering a versatile and reliable solution for your firearm setup.

The JMac Customs™ Folding Mechanism securely locks your stock or brace in the folded position and can be configured to fold left or right for maximum flexibility. Designed for versatility, it features two height adjustments to achieve the perfect fit. The 1913 Folding Mechanism is fully compatible with any 1913/Picatinny rail, while the MRKT Folding Mechanism is designed specifically for MRKT rear trunnions—both providing a secure, stable mounting solution for a wide range of firearms.

Key Features: 

• Unique Proprietary Design – The best folding mechanism on the market, engineered for superior performance and reliability.
• Adjustable & Versatile – Configurable to fold left or right with two height adjustments for a customized fit.

Specifications:

• 4140 Heat Treated Steel 
• QPQ Black Nitride