# HK MR556 Tropentarn 5.56 NATO Semi-Auto Rifle

**Brand:** Heckler & Koch
**Category:** AR Style Rifles
**Caliber:** 5.56 NATO

## Specifications

- **Caliber:** 5.56 NATO
- **Barrel Length:** 16.5"
- **Capacity:** 30 rounds
- **UPC:** 642230268463
- **SKU:** UCBJ1Qkv9

## Description

The Heckler & Koch MR556 is a semi-automatic 5.56 NATO / .223 Remington rifle with a 16.5" barrel and 30-round capacity. This example has a Tropentarn camo finish. It ships new in box.

### Key Specifications
- **Manufacturer:** Heckler & Koch
- **Model:** MR556
- **Caliber:** 5.56 NATO / .223 Remington
- **Barrel Length:** 16.5 inches
- **Capacity:** 30 rounds
- **Condition:** New in Box
- **Finish:** Camo (Tropentarn)
- **Type:** Modern Sporting Rifle (AR)

### Detailed Features

The MR556 uses HK's piston-driven operating system rather than direct impingement, which keeps the bolt carrier group cleaner and runs cooler during sustained fire. The 16.5" barrel sits between a standard 16" carbine and a longer rifle barrel, marginally more velocity than a 16" while staying practical in most settings.

Polymer grips and an adjustable stock make it comfortable across different shooters. The construction quality is consistent with HK's commercial lineup: tight tolerances, quality materials throughout. The Tropentarn pattern is a German military camouflage originally designed for desert and arid environments.

## What Reviewers Say

*Quoted verbatim from YouTube reviews. Each link opens the video at the moment quoted.*

> This gun is heavy it's heavy it's has way too many proprietary parts it's ungodly expensive.
>
> — [Colion Noir](https://www.youtube.com/watch?v=4w_cM9LgrHc&t=119s)

> I think a lot of it has to do with because it is so heavy it mitigates a lot of the recoil so it makes shooting a lot more enjoyable.
>
> — [Colion Noir](https://www.youtube.com/watch?v=4w_cM9LgrHc&t=251s)

> Problem is when you're trucking it around and you've got to carry it then you start to really kind of despise this gun.
>
> — [Colion Noir](https://www.youtube.com/watch?v=4w_cM9LgrHc&t=258s)

> This thing is stupid accurate and I'm not even really I mean come on I'm not shooting match ammo or anything.
>
> — [Colion Noir](https://www.youtube.com/watch?v=4w_cM9LgrHc&t=413s)

> This is the truth it's a phenomenal gun it's incredibly accurate.
>
> — [Colion Noir](https://www.youtube.com/watch?v=4w_cM9LgrHc&t=567s)

## What Customers Say

*AI-generated insights from customer reviews*

The MR556 consistently gets high marks for build quality and reliability. HK's manufacturing standards are well documented, and user accounts reflect that. Accuracy is another recurring positive, with shooters reporting good results from bench to practical distances.

Ergonomics are generally well received: comfortable grip, adjustable stock, solid handling. Some note it runs slightly heavier than competing AR-platform rifles, which matters more in some use cases than others.

The Tropentarn finish gets mixed opinions. Some buyers specifically want it, others would prefer a standard black or more neutral pattern. It's the same durable coating either way.

Cost is the most common sticking point. The MR556 is priced at a premium over most AR-platform alternatives, which prompts ongoing debate about whether the piston system and HK build quality justify the gap versus a quality direct-impingement AR. Aftermarket parts specific to the MR556 are less abundant than standard AR components, which limits some customization paths. Those points aside, buyers who prioritize reliability and build quality tend to consider it money well spent.

## Pricing

**2 offers available**

| Vendor | Price |
|--------|-------|
| Guns Com | $3994.99 |
| Buds Gun Shop | $4280.49 |

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*Data from [GunsNation](https://gunsnation.com)*