Heckler & Koch HK MR556A4 11″ 5.56 MLOK SBR
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: 27.9″ collapsed, 31.7″ extended
- Weight: 7.67 lbs
- 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: HK
- Grip: HK
D. S. (verified owner) –
This is my first purchase with Rooftop Defense. My order was placed, form 3 approved, shipped and delivered to my FFL in 5 days. I was updated throughout the process and I couldn’t have asked for a better experience. Plus a free dinner included!
This won’t be my last purchase from Rooftop Defense,
Travis M. (verified owner) –
Form 3 approved and rifle was shipped within 48 hours. Shipping was quick. Extremely painless process. Would not hesitate to buy an NFA item from Rooftop in the future. Fantastic company to work with.
Michael T. (verified owner) –
Amazing service as always. Form 3 was submitted same day as purchased and was approved/shipped within 24 hours of purchase. Rifle came in quick and was in immaculate condition. Will be running this hard when my form 4 clears. Exceptional service from Rooftop per usual.