HK MR556 for Sale
Browse HK MR556 listings from verified sellers across the U.S. on GunsAmerica.
Quick Look
The HK MR556 is the civilian semi-auto version of the HK416, originally developed for elite military use. Built on a short-stroke gas piston system, it delivers unmatched reliability and premium build quality. The MR556 consistently ranks as a top-tier AR-style rifle with exceptional performance and precision.
Why It's a Top Choice
- Proven HK416 military pedigree with civilian refinement
- Cold hammer-forged barrel for superior longevity
- Free-floated handguard enhances accuracy
- Short-stroke gas piston system runs cleaner than direct impingement
- Exceptional build quality and reliability under hard use
Key Variants
HK MR556A1
Popular civilian model with a 16.5-inch barrel and proprietary HK parts throughout.
HK MR556A1 Upper
Upper assembly available for those building custom HK-based AR platforms.
HK MR556 Competition Model
Tuned for match accuracy with Geissele trigger and upgraded features.
Competitor Comparison Table
| Feature | HK MR556 | Daniel Defense DDM4 V7 | LWRC ICDI |
|---|---|---|---|
| MSRP | $2995 | $1910 | $2100 |
| Capacity | 30+1 | 30+1 | 30+1 |
| Weight | 8.6 lb | 6.2 lb | 7.3 lb |
| Optics-Ready | Yes | Yes | Yes |
| Trigger Type | Polished single-stage | Mil-spec | Enhanced |
| Notable Pro | Near-military construction | Lightweight and customizable | Excellent recoil management |
| Notable Con | High price point | Basic trigger | Heavier than some competitors |
Best Use Cases
- Duty and tactical use
- Precision mid-range shooting
- Rifle competitions
- Premium AR collection
- Training with high-round count reliability
FAQs
What is the difference between the HK MR556 and HK416?
The MR556 is the civilian semi-auto version without select-fire or regulated components like the short barrel or auto sear.
Can I use standard AR-15 parts with the HK MR556?
Some parts are compatible, but key components like the upper, lower, and bolt are proprietary to HK.
How does the HK MR556's gas system differ from other AR rifles?
It uses a short-stroke gas piston, running cleaner and cooler than direct impingement systems common in AR-15s.
