HK MR556A1 5.56 NATO Blue/Black Rifle
Specifications
Action Double Action
Finish Blue/Black
Sights Standard Sights
Weight 8.4 pounds
Capacity 30+1
Grip Safety No
Optic Ready Yes
Barrel Length 16.5 inches
Caliber / Gauge 5.56 NATO
Manual Safety Yes
Threaded Barrel Yes
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
Description
Product Overview
The HK MR556A1 is a premium AR-type rifle from Heckler & Koch, built for reliable semi-automatic performance with match-capable accuracy. It uses HK’s proprietary short-stroke gas piston system to help keep fouling out of the receiver area, paired with a cold hammer-forged unlined barrel designed for long service life. An enhanced 2-stage trigger and refined AR-pattern controls make the MR556A1 well suited for precision shooting and everyday handling.
Key Features
- HK short-stroke gas piston operation helps reduce receiver heat and fouling compared to direct impingement designs
- Cold hammer-forged 16.5-inch unlined barrel with 1 in 7 twist for consistent accuracy
- Factory enhanced 2-stage trigger for improved precision and feel
- Manual safety for straightforward, dependable control
- Adjustable synthetic stock for practical fit and stance options
- Threaded muzzle for compatibility with common muzzle devices and suppressor setups
If you want an HK-built semi-automatic AR-style rifle focused on accuracy and durability, the MR556A1 is a strong choice—ready to run with a rugged, optic-ready setup.
5.0 | 4 Reviews
- SKU:
- 91000010
- UPC:
- 642230259089
- BUDS ID:
- 411558825
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Customer Reviews
5.0 out of 5
4 total reviews
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Latest Reviews
Brian B.
4 years ago
Verified Purchaser
This gun slaps. You...
This gun slaps. You can feel and see the quality. It's heavy though. I personally wish there was a lightweight aftermarket barrel option… a guy can dream. If you are looking for a lightweight rifle look elsewhere. Is it worth $3k+…? It is for me.
Donald F.
6 years ago
Verified Purchaser
Its a HK so not much...
Its a HK so not much else needs to be said. Added to my collection of a 2-Daniel Defense AR 15s and a Larue AR10. The MR556 by far has the best feel from then start. Its a beauty..
Richard M.
6 years ago
Verified Purchaser
So I would like to...
So I would like to start by saying this was my first purchase using Bud's and I have to say I'm extremely satisfied with the entire process. The price was excellent in comparison to other sites Bud's was far and away better in price, they also shipped quickly and very reasonably. Gun came exactly as advertised and shown on their site. All in I will be using Bud's way more frequently. Not much to say about the rifle, if you know about the mr556a1 then you know how amazing it is, and this one is no different, it will never leave the collection. Bud's, thank you you know have a lifetime customer.
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Retail Availability
Bud's Gun Shop - Lexington, KY
1105 Industry Road, Lexington, KY 40505
Bud's Gun Shop - Sevierville, TN
2270 Two Rivers Blvd, Sevierville, TN 37876
Uncle Lee's - Greenville, KY
820 Main St, Greenville, KY 42345
