The MR556 A4 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. 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.
Brand HK
Category Tactical Rifles
Series A4
Model MR556
Caliber 5.56x45mm
Operating System Gas Piston
Stock Finish Group Black
Capacity 30+1
Stock Material Synthetic
Action Semi-Auto
OAL 36.50"
Hand Ambidextrous
Sights None
Barrel Finish Black
Barrel Material Steel
Twist 1:7"
Receiver Description Picatinny Rail
Handguards M-LOK
Trigger Pull Weight 4.50-5.60 lbs
Grooves 6
Height 7.50"
Safety Ambidextrous Safety Lever
Thread Pattern 5 / 8"x24
Width 3.07"
Stock Description 6 Position
Barrel Description Threaded
Barrel Length 16.50"
Max Capacity 30
Receiver Finish Patriot Brown
Weight 7.67 lbs
Stock Finish Black
Handguard Finish Black
Category Tactical Rifles
Series A4
Model MR556
Caliber 5.56x45mm
Operating System Gas Piston
Stock Finish Group Black
Capacity 30+1
Stock Material Synthetic
Action Semi-Auto
OAL 36.50"
Hand Ambidextrous
Sights None
Barrel Finish Black
Barrel Material Steel
Twist 1:7"
Receiver Description Picatinny Rail
Handguards M-LOK
Trigger Pull Weight 4.50-5.60 lbs
Grooves 6
Height 7.50"
Safety Ambidextrous Safety Lever
Thread Pattern 5 / 8"x24
Width 3.07"
Stock Description 6 Position
Barrel Description Threaded
Barrel Length 16.50"
Max Capacity 30
Receiver Finish Patriot Brown
Weight 7.67 lbs
Stock Finish Black
Handguard Finish Black
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