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HK MG4 (HK123)

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MSRP:

$8100.00

Used Price:

$8,100.00

Sale Price:

$9000.00

HK MG4 (HK123) Gun Stats

Palmetto State Armory Palmetto State Armory
Old

From $9,270.00

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The HK MG4 was developed in the 1990's and was first revealed in 2001. It was adopted by the German Bundeswehr in 2004 with plans to supplement and eventually replace the MG3. at the squad support level.

HK MG4 (HK123) For Sale

Guns.com

HK MG4 (HK123)

Guns.com
Guns.com

$8,640.00

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Sportsman's Warehouse

HK MG4 (HK123)

Sportsman's Warehouse
Sportsman's Warehouse

$8,550.00

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Optics Planet

HK MG4 (HK123)

Optics Planet
Optics Planet

$9,360.00

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Guns.com

HK MG4 (HK123)

Guns.com
Guns.com

$8,820.00

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EuroOptic.com

HK MG4 (HK123)

EuroOptic.com
EuroOptic.com

$9,270.00

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KYGUNCO

HK MG4 (HK123)

KYGUNCO
KYGUNCO

$9,000.00

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Academy Sports + Outdoors

HK MG4 (HK123)

Academy Sports + Outdoors
Academy Sports + Outdoors

$9,360.00

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GrabAGun

HK MG4 (HK123)

GrabAGun
GrabAGun

$8,730.00

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Firearms Depot

HK MG4 (HK123)

Firearms Depot
Firearms Depot

$9,180.00

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HK MG4 (HK123) Specs

1 Brand

HK

2 Category

Other Rifle

Technical Data

Length

40.6"

Weight

288 oz

Capacity

100 Round Belt

Barrel Length

17.7"

HK MG4 (HK123) Features

The Heckler & Koch MG4 is a gas-operated, belt-fed light machine gun that is slated to fully replace the MG3 in frontline infantry use with the German Bundeswehr.  It is built with a 17.7 inch quick-detaching barrel that includes a fully-adjustable flip-up front sight, allowing the user to zero their sights with multiple barrels.  The MG4 is also built with a folding stock for easier storage and better mobility.


HK MG4 (HK123) Capacity

The HK MG4 is chambered in 5.56x45mmNATO and is fed by belts of linked ammo connected by M27 links.  Standard-size ammo containers hold 100 round belts inside a box that clips into the underside of the receiver, though there’s nothing stopping an operator from linking as many rounds together as he wants.  The barrels can handle about 200 rounds of cyclic fire before they need to be swapped out to avoid damage from overheating.

Measuring 40.5 inches long (33 inches with the stock folded) with an unloaded weight just shy of 18 pounds, the MG4 falls only slightly behind in mobility when compared against the M249 SAW.  It makes up for this drawback with its folding stock which gives it superior maneuverability while navigating through close-quarter environments and while jumping out of planes.


HK MG4 (HK123) Mobility

Mobility

HK MG4 (HK123) Ergonomics

Ergonomics
The MG3 offers superior ergonomics over similar light machine guns.  The folding stock has a contoured comb similar to the M240 and a buttpad placement that is in-line with the bore.  While this does increase felt recoil slightly, it also improves controllability.  The pistol grip is clearly inspired by the MP5 and G3 rifles, and the front handguard is contoured with the intention of allowing the users to fire the gun from the shoulder.


HK MG4 (HK123) Fit & Finish

There’s two types of German tradition in the firearms world, and that includes superior craftsmanship and not asking the personal beliefs or previous employment of their engineers.  Both of these made Heckler & Koch into one of the best firearm companies, and that quality shows itself yet again in the MG4.


Fit and Finish

How much is a HK MG4 (HK123) worth?

In 2025 a new or used HK MG4 (HK123) value varies depending on supply and demand. In the last 12 months there is great demand for a HK MG4 (HK123) and most other rifles. The Price for a HK MG4 (HK123) has increased in cost by $0.00 in 2025 compared to 2024.

Estimated New and Used Values for a HK MG4 (HK123) Values are based on a basic model with no options or colors.

Condition Trade-In Private Party Dealer
New In box $5,850.00 $7,650.00 $9,000.00
Excellent $5,400.00 $7,200.00 $8,100.00
Very Good $4,950.00 $7,200.00 $8,100.00
Good $4,500.00 $6,750.00 $7,650.00
Fair $3,150.00 $5,850.00 $7,200.00
Poor $2,250.00 $4,500.00 N/A

Gun Value Conditions explained:

New in box - 100% condition in unopened box. Excellent - 95%+ condition with or without box.

Very Good - 90% - 95% condition (all parts/finish should be original).

Good - 80-90% condition (all parts/finish should be original).

Fair - 30% - 80% condition, parts, and finish may or may not be original. Must function properly and shoot.

Poor - under 30% condition. Firearm has severe wear and tear, does not function, or is damaged.

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