NEW RELEASES

We’re continuously machining and developing new products in-house, expanding the lineup based on real performance needs. If you’re watching for updated configurations, new barrel profiles, or small-batch component runs, this is where they’ll show up.

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ALL PRODUCTS

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HK416 / MR556 BARRELS

Built for precision builds. Our HK416 / MR556 Barrels Collection offers premium barrels manufactured to exact specifications for new rifle builds. Designed for reliability, durability, and consistent performance, these barrels provide the foundation you need for a serious build.

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GAS BLOCKS

Reliable function for every build. Our Gas Blocks Collection is engineered for precision fit and dependable performance. Made from premium materials, these components ensure proper cycling and long-term durability whether you’re upgrading or starting a new rifle build. Trusted by shooters who demand reliability, Nefarious Arms gas blocks are built to perform.

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ARMORER'S TOOLS

Built for builders. Our Armorer’s Tools Collection includes the essential gear every gunsmith or enthusiast needs at the bench. From routine maintenance to full builds, these tools are designed for precision, durability, and reliability—helping you get the job done right.

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UPPER RECEIVER PARTS

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Let customers speak for us

from 10 reviews
Anonymous

Wasn’t disappointed. The fit and finish of the 14.5 hk416 are great. Top notch!

Nefarious Arms HK416 / MR556 Barrel, 14.5" SOCOM, 5.56x45mm NATO
Nefarious Arms HK416 / MR556 Barrel, 14.5" SOCOM, 5.56x45mm NATO
Anonymous

Great products offered with fair pricing and excellent finish. Shop with confidence that you are getting quality items.

Nefarious Arms
Anonymous

Excellent fit and finish. My front sight base mount and bayonet lug fit was spot on. Getting it assembled and waiting on a few more parts to hit the range.

Nefarious Arms HK416 A5 Barrel, 14.5" G95 Style, 5.56x45mm NATO
Nefarious Arms HK416 A5 Barrel, 14.5" G95 Style, 5.56x45mm NATO
Dustin Villarreal

Fulfilled my order quickly and packed it nicely. A+ to the folks at Nefarious Arms.

Nefarious Arms
Dustin Villarreal

I havent got a chance to shoot it yet, but the barrel looks phenomenal, always putting out great work at Nefarious Arms. A+ the chrome is shiny and the exterior finish is impeccable.

Nefarious Arms HK416 / MR556 Barrel, 14.5" SOCOM, 5.56x45mm NATO
Nefarious Arms HK416 / MR556 Barrel, 14.5" SOCOM, 5.56x45mm NATO
Kirby Ballard

The shipping was lightning fast, and the website was easy to navigate. Nothing more to say, it was a great shopping experience :)

Nefarious Arms
Anonymous

Great gas block. The fit and finish were exemplary, and the knob was nice and movable, making it easy to turn with the tip of a bullet from various angles. Gassing on a brand new MR556A1 barrel was perfect with the factory-installed 1mm vent screw, giving 1:30-2:30 ejection on N and 3:30-4:30 ejection on S with a B&T SRBS installed. Wonderful product and a great price for everything you get!

NA5 - HK 416A5 Style Adjustable Gas Block
NA5 - HK 416A5 Style Adjustable Gas Block
Mark Milovich

Smooth simple transaction

Nefarious Arms
Mark Milovich

Very nice finish, excellent fit. I like the pin locations have dimpled centres, makes drilling that much easier. Having both the HTX and Nefarious I prefer the latter.

M110 / MKII Gas Block
M110 / MKII Gas Block
BZWS LLC

These are pristine, brand new, unmarked German A3 stripped uppers. They’ve never been assembled. The finish is perfect. Well worth the money.

HK416 A3 Stripped Upper Receiver
HK416 A3 Stripped Upper Receiver

MILITARY / LEO 15% DISCOUNT! Please contact us before placing your order for a discount code to apply at checkout.