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Factory folder AKs are great, but they lock you into a small handful of old-school stock options. The Midwest Industries AK Picatinny End Plate Adapter fixes that. It replaces the standard rear trunnion interface on a 4.5mm pin AK with a Mil-Spec 1913 Picatinny rail, which means the door is suddenly open to a huge world of modern 1913 fixed and side-folding stocks and braces. If you have been eyeing an adjustable stock with a better cheek weld or a folder that actually plays nice with your setup, this is how you get there without pressing in a new trunnion.
The body is machined from 6061 aluminum and given a hardcoat anodized black finish, so it holds up to real range abuse and shrugs off corrosion. The part that most folks appreciate is the steel tension block system. Instead of relying on a loose slip fit, the tension screws pull everything tight against the receiver for a lockup that people consistently describe as zero-wobble. Once it is dialed in and torqued down, it stays put through hundreds of rounds.
With the right tools this is a garage-level job that usually runs about 15 minutes, though the exact steps depend on your rifle. The install involves seating the tension blocks, sliding the adapter into the rear trunnion, and snugging down the tension screws, sometimes with a light tap from a rubber mallet to get it fully seated. Depending on your specific AK, you may need to fit or grind slightly for a clean fit, which is pretty normal territory when working on AK-pattern guns. A dab of blue thread locker on the screws before your first range trip is cheap insurance.
One thing worth knowing up front: this version is built specifically for AKs running the 4.5mm pin diameter, so confirm your pin size before ordering. It is made in the USA and backed by Midwest Industries' lifetime warranty, which tells you they stand behind it.
This version is designed for AK-pattern rifles with a factory folder rear trunnion using a 4.5mm pin diameter. It is not the right part for guns running the 5.5mm pin or Yugo-pattern receivers, so check your pin size first. Midwest Industries makes separate 5.5mm and tang-compatible versions if yours differs.
For many rifles it is a straightforward 15-minute job with basic tools, using the tension blocks and screws to lock it into the rear trunnion. That said, AKs vary quite a bit from maker to maker, and some builds need light fitting or minor grinding for a clean, flush fit. Plan on possibly doing a little tuning depending on your specific gun.
Once installed, the adapter gives you a Mil-Spec 1913 Picatinny rail, which accepts a wide range of 1913-style fixed and side-folding stocks and braces. This is what makes the part so useful, since it frees you from the limited factory folder options. If you plan to side-fold, just verify your chosen stock clears everything, as some Picatinny accessories can limit fold direction.
The steel tension block system is the whole point here. After the tension screws are snugged against the receiver, the lockup is tight with no play, and owners report it holding solid through hundreds of rounds. Adding a bit of blue thread locker before your first session helps keep everything torqued and secure.
| UPC | 812102034308 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MI-AK-PEPA-4.5 |
| Color | Black |
| Length | 5.7500 |
| Model | |
| Product Type | Adaptor |
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