- This firearm must be transferred through a licensed Federal Firearms Licensee (FFL) and cannot be shipped directly to the buyer. This item cannot be shipped to Hawaii, Alaska, or U.S. territories (Puerto Rico, Guam, U.S. Virgin Islands, American Samoa, Northern Mariana Islands).
- Magazine capacity is restricted in certain states. We do not ship this item to states where its capacity exceeds the legal limit -- affected orders are blocked automatically at checkout.
The MR556 A4 runs the same short‑stroke gas piston operating system as HK's military HK416, which keeps hot carbon fouling out of the action entirely -- the reason it genuinely runs longer between cleanings and shows less internal wear than a direct‑impingement AR. A cold hammer‑forged, cannon‑grade 16.5‑inch barrel carries a lifetime bore warranty, an adjustable gas regulator lets you tune the action specifically for suppressed or unsuppressed fire, and a slimline free‑float M‑LOK handguard with fully ambidextrous controls make the A4 genuinely easier to operate than the original MR556. Real HK416 engineering in a semi‑auto rifle, not a civilian rifle just wearing HK's name.
MR556 A4 5.56 16.5" 10+1 BK CA
- Model: MR556 A4
- Caliber/Gauge: 223 Rem | 5.56 NATO
- Action: Semi‑Auto
- Barrel Length: 16.5"
- Capacity: 10 + 1
- Finish: Black
- Overall Length: 33.25" to 36.5"
- Weight: 7.67 lbs.
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