• Black cylindrical object on a white background
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Barrel Nut - HK416 A5

Barrel Nut - HK416 A5

$40.00 USD
$40.00 USD
Sale Sold out
Shipping calculated at checkout.

29 in stock

Precision-machined performance for your HK416 A5 or MR556 build.

The HK416 A5 Barrel Nut is a high-quality, precision-machined replacement designed to match OEM specifications for HK416 A5 and MR556 platforms. Crafted from durable hardened steel and finished to resist corrosion, it ensures a secure barrel fit, proper alignment, and dependable long-term performance for your upper receiver. Perfect for new builds, barrel swaps, or replacements.

Key Features:

  • Precision-machined replacement part
  • Compatible with HK416 A5 and MR556 platforms
  • Hardened steel construction for strength and longevity
  • Machined to OEM specifications for proper fit and alignment
  • Corrosion-resistant black DLC finish for lasting protection
  • Ideal for builds, repairs, or replacements
  • Marked with Haus Logo
  • Made in USA

Upgrade with confidence. Order your HK416 A5 Barrel Nut today and complete your build with precision.

Compatible With: 

  • HK416 A5
  • HK MR556 A4
  • HK MR223 A3
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Let customers speak for us

from 42 reviews
Jake

Very high quality and definitely adds pressure to the system.

Enhanced Reliability Gas Piston
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Sal

Top notch work and awesome service!

Custom Barrel Dimpling
Custom Barrel Dimpling
Meridian Ordnance LLC

Excellent option for the MR556A4 and 416 clones.

Nefarious Arms HK416 / MR556 Barrel, 14.5" LIGHT, 5.56x45mm NATO
Nefarious Arms HK416 / MR556 Barrel, 14.5" LIGHT, 5.56x45mm NATO
Sextus

Marvin and his products are top notch. Perfect fitment, excellent quality. These are the best barrels outside fo factory HK that one can buy!

Nefarious Arms HK416 A5 / G38 Barrel, 11", 5.56x45mm NATO
Nefarious Arms HK416 A5 / G38 Barrel, 11", 5.56x45mm NATO
Rick

Excellent parts / tools and fast shipping service

Nefarious Arms
Rick

For your barrel nut torquing a must have precision made tool. Excellent machined quality to use on a number of AR , KAC , Centurion Arms or HK variants.
Nicer than other popular and similar tools I have. protect your barrel extension index pin! Get one!

Reaction Rod – Armorer’s Multi-Platform Upper Receiver Holding Tool
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Brian Bell

Great part. Will install on my next build.

HK416 / MR556 / G36 Complete Gas Piston #50205381
HK416 / MR556 / G36 Complete Gas Piston #50205381
Brian Bell

Excellent service, fast shipping thank you!!

Nefarious Arms
Brian Bell

Excellent Quality, fast shipping what more could a man ask for. Thank you as always.

Barrel Nut - HK416 A5
Barrel Nut - HK416 A5
THANH D. LY

High quality and fast shipping

M110 / MKII Gas Block
M110 / MKII Gas Block
Anonymous

Quality is absolutely stellar. Nefarious arms nails it everytime

Barrel Nut - HK416 A5
Barrel Nut - HK416 A5
Anonymous

Quality is absolutely stellar. Nefarious arms nails it everytime

Enhanced Reliability Gas Piston
Enhanced Reliability Gas Piston
Zach Martin

Barrel is absolutely perfection. Knocked it out of the park

Nefarious Arms HK416 / MR556 Barrel, 10.4" HEAVY, 5.56x45mm NATO
Nefarious Arms HK416 / MR556 Barrel, 10.4" HEAVY, 5.56x45mm NATO
Zach Martin

Quality is absolutely stellar. Nefarious arms nails it everytime

Nefarious Arms
Anonymous

Quality is absolutely stellar. Nefarious arms nails it everytime

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