Will this fit my AK-47 or AK-74 rifle?

Yes, it fits any AK variant with a 4.5mm rear trunnion. If your rifle uses a 5.5mm hinge, you’ll need a different model or an adapter.

Can I fold this stock to either side?

Most 4.5mm folding stocks fold to the left side of the rifle to clear optics and charging handles.

Does this stock require permanent modification?

No — installation is fully reversible and does not require cutting, drilling, or welding.

What’s the difference between 4.5mm and 5.5mm AK stocks?

The difference lies in the hinge pin diameter. 4.5mm stocks were used on older AK-100 series rifles, while 5.5mm models are more common on newer AK-74M and Saiga rifles.

Do you sell adapters for non-folding receivers?

Yes. Mounts Plus carries both 4.5mm and 5.5mm folding stock adapters for stamped and milled receivers.

4.5mm AK Folding Stock – Factory Fit Upgrade

**B5 Systems AK Stock 4.5mm – OD Green** $118.75

**B5 Systems AK Stock 4.5 mm – Black** $118.75

**B5 Systems AK Stock 4.5mm - Plum** $118.75

**Midwest Industries AK Picatinny End Plate Adapter – 4.5mm** $69.95

4.5mm AK Folding Stock – Precision Fit for AK-47 & AK-74

Upgrading your AK isn’t just about looks — it’s about precision, performance, and feel. The Mounts Plus 4.5mm AK Folding Stock is engineered for shooters who want a rock-solid, factory-level fit without compromise.

Built for AK rifles with 4.5mm folding trunnions, this stock provides a secure lock-up, smooth folding action, and the durability to handle thousands of rounds. Whether you run an Arsenal, PSA, or Bulgarian-pattern AK, this stock drops in perfectly and transforms your rifle’s handling in minutes.

Engineered for the Perfect 4.5mm Fit

The 4.5mm version is specifically designed for rifles using smaller trunnion pins — found on PSA, Arsenal, and Bulgarian AK models. This isn’t a “universal” adapter — it’s precision-machined for exact alignment with your factory folding trunnion, ensuring a tight, rattle-free connection.

The result? A smooth, reliable hinge that folds compactly, locks up tight, and feels just like an original factory build.

If your AK is built for a 4.5mm pin, this is the stock that gives it the factory feel and function it deserves.

Key Features

Designed for 4.5mm Trunnions – Fits PSA, Arsenal, and other compatible rifles.
Rugged, Lightweight Construction – Reinforced polymer body with steel hinge components.
Smooth Folding Mechanism – Secure, wobble-free lock-up every time.
Comfortable Cheek Weld – Ideal for optic use and precision shooting.
Non-Reflective Matte Finish – Durable, tactical look that resists scratches.
Quick Installation – Drop-in design fits existing 4.5mm trunnions.
Made in the USA – Quality you can trust from American engineering.

Every stock is built with the same attention to detail you expect from high-end AK components — strong, simple, and made to last.

Compatibility

This 4.5mm folding stock fits:

AK-47 & AK-74 rifles with 4.5mm rear trunnions
PSA AK-E and AK-103 series rifles
Arsenal SLR and SAM7SF models
Bulgarian factory folders and conversions

Not sure if your AK uses a 4.5mm or 5.5mm trunnion? Check your rear hinge pin size — this model fits the smaller 4.5mm variant commonly found on PSA and Bulgarian-pattern rifles.

Installation Made Simple

Installing your Mounts Plus 4.5mm AK Stock is straightforward:

Ensure your rifle is clear and safe.
Align the hinge with your factory trunnion pin holes.
Insert and secure the provided hardware.
Test the folding action and lock-up.

That’s it — no cutting, welding, or gunsmithing required. The result is a professional-grade upgrade that feels like an OEM installation.

Built for Real-World Reliability

Mounts Plus designed this stock for shooters who demand more from their AK. The polymer body is reinforced for strength under recoil, and the hinge system ensures consistent lock-up even after thousands of folds.

It’s lightweight enough for fast handling but strong enough to trust in the field. Whether you’re building a precision rifle or a tactical setup, this stock brings modern performance to a classic platform.

Specifications

Specification	Detail
Model	4.5mm AK Folding Stock
Material	Reinforced Polymer + Steel Hardware
Finish	Matte Black, OD Green, or Plum
Compatibility	AK-47 / AK-74 with 4.5mm Trunnion
Fold Direction	Left Side
Weight	12.4 oz
Made In	USA

Why Choose Mounts Plus

Mounts Plus has been trusted by builders, professionals, and enthusiasts for years because we focus on what matters — precision fit, American-made quality, and products that actually perform.

When you choose a Mounts Plus 4.5mm AK Stock, you’re getting more than a part — you’re getting a commitment to quality and reliability.

Frequently Asked Questions

Q: What’s the difference between the 4.5mm and 5.5mm AK stocks?
A: The 4.5mm version fits AKs with smaller hinge pins, like PSA and Arsenal rifles. The 5.5mm version fits Russian-pattern trunnions.

Q: Will this fit my PSA AK-103 or AK-E?
A: Yes — these rifles use 4.5mm folding trunnions, and this stock fits perfectly.

Q: Is it compatible with both AK-47 and AK-74 rifles?
A: Absolutely. Any rifle using a 4.5mm folding trunnion system is compatible.

Q: Is this stock made in the USA?
A: Yes. Every Mounts Plus 4.5mm AK Stock is designed and manufactured in the USA with strict quality control.

Q: Do I need a gunsmith to install it?
A: No. It’s a drop-in installation — most users complete the process in under 20 minutes using simple tools.

Upgrade Your AK with Mounts Plus

The 4.5mm AK Folding Stock combines factory fit with modern materials and performance. It’s strong, comfortable, and designed for serious shooters who demand precision and reliability from every part of their rifle.

If your AK uses a 4.5mm trunnion — this is the upgrade you’ve been waiting for.