1 2

HK416, MR556 Piston Rod, Complete Assembly

HK416, MR556 Piston Rod, Complete Assembly

$110.00 USD
$110.00 USD
Sale Sold out
Shipping calculated at checkout.

70 in stock

Genuine HK performance — accept no substitutes.

The HK416 / MR556 Piston Rod Complete Assembly is a factory-original Heckler & Koch OEM part, engineered to the same exacting standards trusted by professional operators worldwide. Designed for flawless reliability and smooth operation, this piston rod assembly keeps your HK system performing exactly as intended — clean, consistent, and dependable.

Key Features:

  • Factory OEM HK part — genuine Heckler & Koch manufacture
  • Precision-machined and heat-treated for exceptional durability
  • Designed for clean, consistent gas system performance
  • Compatible with HK416 and MR556 platforms
  • Complete and ready to install — no fitting required

Upgrade or replace with confidence. Order your genuine HK416 / MR556 Piston Rod Complete Assembly today.

Compatible with: 

  • HK 416
  • HK MR556
  • HK 417
  • HK MR762
View full details

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

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