Upgrade your Arsenal AK rifle with seamless compatibility using the MSR Adapter Pin Set. Designed specifically for attaching earlier generation 4mm Russian, Bulgarian, and US-made Arsenal Inc. buttstocks to newer 5.5mm rear blocks, this precision-engineered set bridges the gap between legacy furniture and modern receiver configurations.
Key Features
- Precise Pin Adapters: Includes a complete set of hardened steel pins engineered to convert 4mm buttstock mounting to fit 5.5mm rear trunnion blocks without modification.
- Universal Compatibility: Works with older Russian, Bulgarian, and US Arsenal Inc. stocks on current-generation Arsenal rifles, preserving the value of your existing furniture.
- Durable Construction: Manufactured from high-strength materials for reliable fitment and long-term performance under recoil and field use.
- Easy Installation: Drop-in design requires no gunsmithing or permanent alterations, allowing quick swaps between stock options.
Benefits for AK Enthusiasts
Owners of vintage Arsenal buttstocks often face compatibility challenges with updated rifle models. This adapter pin set solves that pain point by providing a secure, factory-correct interface that maintains proper alignment, reduces play, and ensures stable cheek weld and shouldering. Whether restoring a classic build or expanding your options, it delivers professional-grade functionality without compromise.
Specifications
- Weight: 0.3 oz
- Dimensions: 1.8″ L x 0.22″ W x 0.22″ H
- Material: Hardened steel construction
- Application: 4mm to 5.5mm buttstock adapter for Arsenal AK platforms
Why Choose This Product
Engineered by MSR Distribution for exacting Arsenal specifications, this pin set offers a targeted solution trusted by serious shooters and collectors. Its compact size makes it an essential addition to any AK parts kit, ensuring your legacy components integrate flawlessly with contemporary rifles.
Ensure proper fitment for your specific Arsenal model before installation to achieve optimal performance and safety.

