Riley Defense RPK .308 WIN 22-inch M77B Yugo Surplus

The Riley Defense RPK .308 WIN 22-inch M77B Yugo Surplus is a milled-receiver RPK-pattern rifle that takes the legendary Yugoslav M77B kit and adds modern American-made components. Chambered in .308 Winchester, it comes with a 22-inch 4150 nitride barrel, adjustable gas system, and surplus wood furniture that shows honest service marks. This is a heavy-hitting semi-auto built for durability and accuracy, ready for the range or the field.

Manufacturer	Riley Defense
Model	RDI RPK (M77B Yugo Surplus Kit)
Material	Milled steel receiver, 4150 nitride barrel, wood furniture
Compatibility	7.62x51mm NATO / .308 Winchester
Finish	Nitride barrel, parkerized receiver and components
Weight	Approximately 9.5 lbs (per manufacturer specs)
Condition	New build with surplus wood furniture showing service markings

Key Features

• Milled Receiver – Why it matters: A one-piece milled receiver adds rigidity and longevity, reducing flex under heavy .308 recoil.
• 22-Inch 4150 Nitride Barrel – Why it matters: The nitride finish resists corrosion and wear, while the 22-inch length gives you more velocity and a flatter trajectory.
• Adjustable Gas System – Why it matters: Tune the gas to match your ammo or suppressor, keeping the action smooth and reliable.
• Surplus Wood Furniture – Why it matters: Genuine Yugoslav wood with service markings gives you that classic battlefield look and feel.
• Threaded Muzzle (14×1 LH) – Why it matters: Ready for muzzle devices or suppressors right out of the box.

Who It’s For

This rifle is built for recreational shooters who want a heavy-barrel .308 semi-auto that’s rugged and accurate. First-time buyers will appreciate the adjustable gas system and straightforward controls. It’s also a solid pick for anyone who digs surplus military aesthetics but wants modern internals.

Pros & Cons

Pros:

• Milled receiver adds strength and accuracy
• Adjustable gas system for versatility
• Surplus wood furniture with character
• Threaded barrel for accessories

Cons:

• Heavier than a standard AK-pattern rifle (around 9.5 lbs)
• Surplus wood may have dings or wear (adds to the look but not for collector-grade perfectionists)

Comparison

Feature	Riley Defense RPK .308	Zev Technologies OZ9	Geissele Super Duty
Caliber	.308 Win / 7.62×51	9mm	5.56 NATO
Receiver Type	Milled steel	Forged aluminum	Forged aluminum
Barrel Length	22 inches	4.5 inches	14.5 inches
Gas System	Adjustable	Fixed	Fixed
Weight	~9.5 lbs	~1.5 lbs	~6.5 lbs
Price	$2,052.51	~$1,200	~$1,800

Compared to the Zev OZ9 and Geissele Super Duty, the Riley Defense RPK is a heavier, longer-range option with a milled receiver and adjustable gas system. It’s built for .308 power, not compact carry.

FAQ

Is this rifle compatible with standard AK magazines?

No, this uses a proprietary 20-round steel magazine designed for the Yugoslav M77B pattern. It’s included in the package.

Can I mount a scope on this rifle?

Yes, the receiver has a side rail mount that accepts standard AK-style optics mounts. You can also use a railed dust cover if you prefer.

What kind of accuracy can I expect?

With quality .308 ammunition, expect 1.5-2 MOA groups at 100 yards, thanks to the 22-inch nitride barrel and milled receiver.

Does the adjustable gas system work with suppressors?

Yes, you can turn down the gas for suppressed shooting to reduce recoil and gas blowback.

Is the wood furniture new or used?

The wood is surplus, so it shows service marks and wear from military use. It’s solid but not pristine.

Ready to Add This to Your Collection?

This Riley Defense RPK .308 Win 22-inch M77B Yugo Surplus is a tough, accurate semi-auto that blends surplus soul with modern reliability. Whether you’re plinking at the range or taking it hunting, it delivers.

• ✅ Nationwide delivery (all 50 states)
• ✅ Ships 1-2 business days
• ✅ 30-day returns
• ✅ Secure checkout

Check out more in our Semi Auto Rifles and AK Pattern Rifles categories.

Last updated: April 2026