Introducing the MR A4
M-LOK interface with integral ambi QD cups
HK416 2-position adjustable gas block
New lighter HK USA slimline
handguard
Match rifle cold-hammer-forged barrel. Barrel bore is guaranteed for life against wear. You shoot it out, we replace it. Period.
Suppressor-ready
MR A4 556: Concentric 1/2 x 28 threads
MR A4 762: Concentric 5/8 x 24 threads
Toolless front and rear take down pins
Updated angled magazine well for reliable feeding from all AR pattern magazines
Continuous picatinny rail interface
between upper receiver and
handguard
HK416 elongated steel castle nut
HK416 A5 upper receiver
Ambi safety selector with 45-degree throw
Winter trigger guard
Up to 30 Round Magazine
MR A4 556: 30 or 10 round magazine
MR A4 762: 20 or 10 round magazine
New HK USA enhanced ergonomic grip
Extended, ambidextrous charging handle with dual claws
HK416 over the beach buffer tube with
tension screws
HK416 slimline, six-position stock
(nine-position for MR762)
Introducing the A4
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.
MR A4 Models
MR556 A4 - 16.5 in
MR762 A4 - 16.5 in
