RSA 1913 Stock / Brace Adapter - 4.5mm

RSA 1913 Stock / Brace Adapter - 4.5mm

The JMac Customs™ 1913 Stock/Brace Adapter offers a robust and reliable mounting solution for AK-pattern rifles and pistols configured with a 4.5mm side-folding trunnion. Machined from 7075-T6 aluminum and finished with a Type 3 hardcoat anodizing, this adapter provides a tight, rock-solid interface for any MIL-STD-1913 compatible stock or brace, including those from JMac's own lineup. It installs easily using existing factory hardware—no permanent modifications required.

Whether you're assembling a folding SBR or upgrading your brace setup, this adapter ensures reliable performance, modularity, and a clean fit.

Universal Compatibility
Works with all 1913-style stocks or braces, including JMac Customs™ components

Optimized for 4.5mm AK Folding Trunnions
Installs in place of factory stock using OEM hardware

Folding-Capable with Locking Support
Locks securely when paired with compatible folding mechanisms

Premium Materials
CNC machined from 7075-T6 aluminum with military-grade anodized finish

No Permanent Modifications
Drop-in installation for ease and convenience

Ideal for Compact or Folding Builds
Keeps profiles tight without sacrificing durability

Specifications

• Manufacturer: JMac Customs™
• Model: RSA-4.5 (4.5mm Folding Adapter)
• Mounting Interface: MIL-STD-1913 (Picatinny)
• Fitment Notes:
  • May require minor fitting with select PSA 4.5mm trunnions
  • Compatible with factory hardware—no cutting or drilling required
• Material: 7075-T6 Aluminum
• Finish: Type 3 Hardcoat Anodize
• Weight: 1.1 oz
• Folding Capability: Host Dependent
• Locks When Folded: Yes (with compatible folding mechanism)