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Midwest Industries AK Picatinny End Plate Adapter – 5.5mm
If you’re upgrading your AK, you know precision matters. The Midwest Industries AK Picatinny End Plate Adapter (5.5mm) is built for shooters who demand strength, reliability, and a perfect fit every time. Designed specifically for AK rifles with 5.5mm folding trunnions, it gives your rifle the modern versatility of a 1913 Picatinny interface — ready for folding or fixed stocks and braces.
Machined from 6061 hardcoat anodized aluminum, this adapter provides a rock-solid mounting point that won’t shift, rattle, or wear down. Whether you’re running a Russian-pattern AK, KP-9, or Saiga, this adapter lets you upgrade with confidence and precision.
Purpose-Built for 5.5mm Trunnions
AKs come in two major folding trunnion sizes — 4.5mm and 5.5mm. This model is made specifically for the larger 5.5mm trunnion pins, common on Russian, KP-9, and select Arsenal rifles. The result is a perfect fit that locks up tight and folds smoothly without any play or alignment issues.
With this adapter, you can modernize your AK’s stock system, add modularity, and achieve a stronger, cleaner connection between rifle and stock — all while keeping that classic AK feel.
Key Features
- 5.5mm Folding Trunnion Compatibility – Fits Russian-pattern AKs, KP-9s, and select Arsenal models.
- 1913 Picatinny Interface – Mount any Picatinny-compatible fixed or folding stock or brace.
- CNC-Machined 6061 Aluminum – Lightweight yet strong for years of reliability.
- Hardcoat Anodized Finish – Resists corrosion and wear under harsh conditions.
- Zero Wobble Fit – Tight tolerances eliminate play and maintain alignment.
- Drop-In Installation – Simple setup with basic tools.
- Made in the USA – Precision engineering backed by Midwest Industries’ lifetime quality.
This isn’t a generic import. It’s purpose-built for shooters who expect every part of their rifle to work as hard as they do.
Easy Installation
You don’t need a gunsmith — just basic tools and about 15 minutes.
- Ensure your rifle uses a 5.5mm folding trunnion.
- Remove the existing trunnion or rear assembly.
- Align the Midwest Industries adapter with the hinge pin holes.
- Secure using the provided hardware.
- Check lock-up and folding function before live use.
Tip: Always verify your trunnion size before ordering — this model is for 5.5mm trunnions only.
Why the 5.5mm Adapter Makes a Difference
Russian-pattern AKs, KP-9s, and Saiga rifles use a larger 5.5mm folding pin, which means the adapter must be precision-engineered for proper alignment and lock-up.
This version ensures:
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Consistent stock alignment with no tilt or looseness.
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A factory-grade fit that feels OEM.
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Seamless folding and extended durability under repeated use.
If your rifle uses a 5.5mm trunnion, this adapter is the exact fit you’ve been looking for — no modifications, no guesswork.
Performance You Can Trust
Midwest Industries has earned its reputation for building rugged, American-made firearm components that simply work.
Each AK Picatinny End Plate Adapter is machined and finished in-house in Wisconsin to the highest standards of precision and reliability.
The 6061 aluminum body delivers a lightweight yet incredibly strong platform, while the hardcoat anodized finish protects against the elements and years of field use. It’s tested, trusted, and ready to perform.
Technical Specifications
| Specification | Detail |
|---|---|
| Model | AK Picatinny End Plate Adapter (5.5mm) |
| Material | 6061 Aluminum |
| Finish | Hardcoat Anodized |
| Compatibility | 5.5mm Folding Trunnions (Russian Pattern) |
| Interface | 1913 Picatinny Rail |
| Weight | 3.2 oz |
| Made In | USA |
Frequently Asked Questions
Q: What’s the difference between the 4.5mm and 5.5mm adapters?
A: The 5.5mm version fits AKs with larger hinge pins — found on Russian-pattern rifles like the KP-9 and Saiga. The 4.5mm fits PSA and Bulgarian-pattern AKs.
Q: Will this work with my KP-9 or Saiga rifle?
A: Yes. Both the KP-9 and Saiga rifles use 5.5mm trunnions, and this adapter provides a precise, factory-level fit.
Q: Can I attach any 1913 Picatinny stock or brace?
A: Absolutely. The integrated rail allows you to mount folding or fixed stocks and braces from most major manufacturers.
Q: Do I need a gunsmith to install it?
A: No. Installation is simple and takes about 15–20 minutes using basic tools.
Q: Is this product made in the USA?
A: Yes. Every Midwest Industries AK adapter is machined, finished, and assembled in Wisconsin, USA.
Why Midwest Industries
When you choose Midwest, you’re choosing precision American manufacturing backed by years of trusted performance.
Every component is built for shooters who value reliability, attention to detail, and products that perform flawlessly when it matters most.
The AK Picatinny End Plate Adapter – 5.5mm isn’t just an upgrade — it’s a refinement. It brings modern versatility to the AK platform while preserving the simplicity and durability that make the rifle legendary.
Upgrade Your AK Today
Transform your AK into a modern, modular platform with the Midwest Industries AK Picatinny End Plate Adapter (5.5mm).
Built for precision. Designed for reliability. Made in the USA.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov.
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