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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 5 reviews
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.