1 2

HK416, MR556 PDW Piston Rod, Complete Assembly

HK416, MR556 PDW Piston Rod, Complete Assembly

$150.00 USD
$150.00 USD
Sale Sold out
Shipping calculated at checkout.

Out of stock

The HK416 / MR556 PDW Piston Rod Complete Assembly is a factory-original Heckler & Koch OEM part, professionally modified for the PDW (Personal Defense Weapon) configuration. Built to maintain proper gas timing and reliable cycling in short-barrel HK setups, this assembly delivers the same legendary HK performance in a compact form factor.

Key Features:

  • Factory OEM HK part — genuine Heckler & Koch manufacture
  • Modified specifically for HK416 / MR556 PDW configurations
  • Precision-machined and heat-treated for durability
  • Ensures proper gas operation in short-barrel systems
  • Complete and ready to install — no fitting required

Built for reliability. Order your HK416 / MR556 PDW Piston Rod Complete Assembly today.

Compatible with: 

  • HK 416 PDW
  • HK MR556 PDW
View full details

Let customers speak for us

from 36 reviews
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

HK416 Ejection Port Axle
HK416 Ejection Port Axle
Anonymous

Quality is absolutely stellar. Nefarious arms nails it everytime

HK416, MR556 Piston Rod, Complete Assembly
HK416, MR556 Piston Rod, Complete Assembly
Dustin Villarreal

Helps immensely when pushing pins. Keeps everything stable and easy to work with. Keeps you from marring your barrels!

Gas Block Assembly Tool
Gas Block Assembly Tool
Dustin Villarreal

Gives me the confidence to work on my 416 platform gun without damaging anything. Works on multiple platforms as well.

Reaction Rod – Armorer’s Multi-Platform Upper Receiver Holding Tool
Reaction Rod – Armorer’s Multi-Platform Upper Receiver Holding Tool
Dustin Villarreal

Folding sight arrived in great shape. Works with my 33mm height rear just fine. A+

HK 33mm Front Folding Sight – HK416 / HK417 / MR556 / MR762 | Genuine HK #235251
HK 33mm Front Folding Sight – HK416 / HK417 / MR556 / MR762 | Genuine HK #235251
Dustin Villarreal

Awesome tool! Its well made, helps with working on yhe 416 platform specifically. Great finish too.

Multi-Tool
Multi-Tool
Tony L.

Same ol’ great NA quality we’ve all come to expect. Super cool threads!

Nefarious Arms T-Shirt
Nefarious Arms T-Shirt