Heckler & Koch HK MR556A4 11″ 5.56 MLOK Pistol
The latest update from HK-USA to the commercial variant of the legendary HK416, the MR556 A4 and MR762 A4 represent an enhanced example of “no compromise” HK performance.
Its short-stroke gas piston operating system does not impart hot carbon fouling back into the action, allowing the weapon to run longer, with less maintenance and with less wear on internal components than direct-impingement ARs. Its adjustable gas regulator allows the operator to tune the action specifically for suppressed or unsuppressed operation. Fully ambidextrous controls, lighter weight and a slimmer profile make the new A4 easier to operate, manipulate and employ.
For those who demand an AR with unmatched capability and uncompromising reliability and durability, the MR A4s remain the top tier solution.
Specifications
- Length: 26.5″
- Weight: 6 lbs 9.76oz
- Caliber: 5.56mm
- Color: Black
- Lower Receiver: Forged, HK Ambidextrous
- Upper Receiver: Forged, HK MR556A4
- BCG: MR556A4
- Rail: MLOK
- Trigger: HK Two-Stage
- Barrel: 11″ Cold Hammer-Forged Barrel, 1:7 Twist
- Gas System: Short-Stroke Gas Piston
- Gas Block: Adjustable
- Charging Handle: HK Ambidextrous
- Muzzle Device: Birdcage
- Lower Parts Kit: Ambidextrous
- Buffer Tube: 6 Position
- Buffer Assembly: HK Heavy Buffer
- Stock: None
- Grip: HK
Cade W. (verified owner) –
First HK and it’s great I’ll never get rid of it. What made it all better was how quick and responsive rooftop was shoutout Sol!
Christian D. (verified owner) –
I can’t recommend Rooftop enough! Shipping was lightening quick as always. As for the HK it is excellent and I highly recommend trying one if you can deal with the price LOL
Daniel (verified owner) –
Phenomenal shooting experience and the sweatshop gang had it shipped same day per usual. Always a great experience dealing with Rooftop.
Fitz F. (verified owner) –
Sol and the Sweatshop are pretty awesome! I ate too much ramen stationed in Korea so i gave it away to my buddy 😉
As far as the HK goes, it’s pretty awesome. I haven’t completed the SBR forms yet so I only did some limited range time.
But I am an HK guy and the quality is suberb. The fit between the upper and lower is tighter than a seals butt.
I will follow up after the EOTech and other goodies are added on
Danny (verified owner) –
Grabbed one of the first HK MR556 A4 pistols to arrive. I have been extremely happy with my purchase. Always outstanding service from the team at Rooftop Defense. Received a shipping notification shortly after my purchase.