The Heckler and Koch MR556A1 75th Anniversary 5.56mm rifle (model 81001001) is a premium, collector grade semi automatic modern sporting rifle that blends HK416 lineage with a limited edition Flecktarn finish for serious shooters and HK fans. This MR556A1 5.56mm platform is built for duty grade reliability, hard use at the range, and long term value for enthusiasts and collectors.
Key Features
- Model: Heckler and Koch MR556A1 75th Anniversary, part number 81001001.
- Caliber: 5.56x45mm NATO, also compatible with .223 Remington.
- Action: semi automatic, gas piston operated.
- Operating system: HK proprietary short stroke gas piston with solid operating rod.
- Capacity: 30 plus 1 rounds, includes four magazines.
- Barrel length: 16.50 inch heavy profile barrel.
- Barrel construction: cold hammer forged steel barrel made from cannon grade steel.
- Barrel finish: black steel.
- Twist rate: 1 in 7 inch, six groove rifling.
- Receiver material: aluminum receiver.
- Receiver finish: Flecktarn camo with Picatinny rail on top.
- Handguard: free float M-LOK handguard with Flecktarn camo finish.
- Stock: black synthetic adjustable stock.
- Grip: black polymer pistol grip.
- Sights: shipped with no fixed sights, full length Picatinny rail ready for optics or backup sights.
- Overall length: approximately 33.9 to 37.68 inches.
- Weight: approximately 8.6 pounds.
- Trigger pull weight: about 7.64 pounds.
Special Features
- Direct descendant of the HK416 series adapted for the civilian market while maintaining duty grade internals and design.
- HK closed piston system keeps hot gases out of the receiver for cooler, cleaner operation and enhanced reliability in dust, sand, and mud.
- Cold hammer forged barrel from cannon grade steel engineered for long service life and consistent accuracy even after high round counts.
- Limited 75th Anniversary edition with Flecktarn camo receiver and handguard, plus special engraving that appeals to HK collectors and brand loyalists.
- Free float M-LOK handguard allows solid mounting of lights, bipods, and accessories without contacting the barrel.
- Full length Picatinny top rail provides generous space for red dots, LPVOs, magnifiers, or night vision accessories.
- Includes four magazines from the factory to get the HK MR556A1 75th Anniversary 5.56mm rifle range ready out of the box.
Practical Benefits
- Ideal for experienced shooters and serious collectors who want a semi automatic 5.56mm rifle with HK416 heritage, premium materials, and a limited edition configuration.
- The short stroke gas piston system helps keep the MR556A1 75th Anniversary 5.56mm running cleaner over long training days, defensive courses, or high volume range sessions.
- Free floated cold hammer forged barrel and rigid M-LOK handguard support accurate fire for patrol style competition, target shooting, or practical training.
- Adjustable stock and ambidextrous safety selector make the Heckler and Koch MR556A1 75th Anniversary a solid fit for a wide range of shooters and positional shooting styles.
- Flecktarn camo finish and 75th Anniversary markings give this rifle strong collector appeal while still being fully capable for duty use, home protection, and serious range work.
The Heckler and Koch MR556A1 75th Anniversary 5.56mm rifle model 81001001 is a dependable option for serious range training, professional style use, and long term HK collection value.
| MANUFACTURER | HECKLER & KOCH |
| MODEL | MR556A1 |
| CALIBER | 5.56MM |
| TYPE | RIFLE |
| PREMIUM | YES |