Midwest Industries AK Picatinny End Plate Adapter – 4.5mm
Not Yet Rated | Write the First Review SKU: 222-MID-MI-AK-PEPA-4.5
UPC: 812102034308
MFG#: MI-AK-PEPA-4.5

Midwest Industries AK Picatinny End Plate Adapter – 4.5mm

If you’re upgrading your AK to a modern setup, the Midwest Industries AK Picatinny End Plate Adapter (4.5mm) is the foundation you need. Designed for factory 4.5mm folding trunnions, it gives your rifle a precision-machined 1913 Picatinny rail interface, allowing you to mount your favorite fixed or folding stocks and braces with confidence.

Built in the USA from 6061 hardcoat anodized aluminum, this adapter is all about strength, simplicity, and perfect fitment. It turns your traditional AK into a flexible, modular platform while keeping that solid Midwest Industries reliability shooters have trusted for decades.

Why Choose the 4.5mm Version

Not all adapters are created equal. The 4.5mm version is built specifically for AKs that use smaller trunnion pins — common on Arsenal, PSA, and Bulgarian-pattern rifles. That precision ensures a snug, wobble-free fit and proper alignment of your folding mechanism.

If you’ve ever dealt with an adapter that doesn’t line up right or feels loose, this eliminates that problem entirely. The engineering tolerances are tight, the lock-up is firm, and the installation is straightforward.

Key Features

• 1913 Picatinny Rail Interface – Mount stocks, braces, or folding assemblies quickly and securely.

• Precision-Machined 6061 Aluminum for strength without unnecessary weight.

• 4.5mm Factory Trunnion Compatibility – Fits Arsenal, PSA, and similar models perfectly.

• Hardcoat Anodized Finish for corrosion resistance and long-lasting durability.

• Tight Tolerance Fit prevents movement, ensuring consistent accuracy.

• Drop-In Installation – No gunsmithing required.

• Made in the USA with lifetime quality guarantee.

Every feature is designed to help your AK evolve into a modernized, high-performance rifle without compromising its original reliability.

Installation Made Simple

You don’t need a gunsmith to install this — just basic tools and a few minutes of your time.

1. Remove your factory trunnion or stock assembly.

2. Align the Midwest Industries adapter with your 4.5mm pin holes.

3. Install and tighten using the included hardware.

4. Confirm alignment, lock-up, and you’re done.

Most users complete the process in under 20 minutes.

Performance and Compatibility

This adapter fits most AK factory folders with a 4.5mm pin diameter, including:

• Arsenal SAM7SF and similar Bulgarian models

• Palmetto State Armory (PSA) AK-E and AK-103 series

• SLR Rifleworks and custom 4.5mm builds

Compatible with any 1913 Picatinny-mounted stock or brace, including folding assemblies from top manufacturers.

It’s a rock-solid foundation for your next custom build — whether you’re going for a tactical SBR or a lightweight range rifle.

Built for Real Shooters

This adapter isn’t just another imported piece of aluminum. It’s CNC-machined in Wisconsin to the same precision standards used in Midwest’s military and law enforcement products.

Every unit is tested to ensure consistent lock-up, zero wobble, and flawless function. The result: an AK upgrade that feels factory-built, not aftermarket.

You’ll notice the difference immediately — smoother folding action, tighter fit, and improved overall balance.

Technical Specifications

Why Midwest Industries Leads the Industry

Midwest Industries doesn’t chase trends — it defines them. Every product is engineered, tested, and built in America to deliver unmatched performance and reliability.

When you choose Midwest, you’re not just buying parts — you’re investing in craftsmanship trusted by shooters, competitors, and professionals across the country.

Frequently Asked Questions

Q: What’s the difference between the 4.5mm and 5.5mm adapter?
A: The 4.5mm version fits smaller trunnion pins found on PSA and Arsenal rifles, while the 5.5mm fits Russian-pattern trunnions.

Q: Will this work with my PSA or Arsenal AK?
A: Yes, this adapter is designed specifically for 4.5mm factory folders found on PSA, Arsenal, and Bulgarian rifles.

Q: Can I attach a folding stock?
A: Absolutely. The integrated 1913 Picatinny rail lets you install most folding or fixed stocks and braces with zero play.

Q: Is this made in the USA?
A: Yes — every Midwest Industries adapter is designed, machined, and anodized in the USA with premium materials.

Q: Do I need a gunsmith to install it?
A: No. It’s a drop-in installation that can be completed in under 20 minutes with basic tools.

Upgrade Your AK Today

The Midwest Industries AK Picatinny End Plate Adapter – 4.5mm is built for shooters who want modern performance with traditional AK reliability.

It’s precise, durable, and proudly American-made — the perfect way to give your rifle a 21st-century upgrade without compromising what makes it an AK.