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Interesting video.
Curious why the two shooters (Martin Stussack and Marc Roth) were not using starter tabs for loading/reloading.
It avoids ever having to raise the feed tray cover. Faster and looks slicker on video.

The submersion pieces are kind of weak when you raise the muzzle on an open bolt gun and let the water drain out for 3-5 seconds before firing. NO BIG DEAL.

And what's with only 200 round belts?! HK21E's could do 500 and even 1000 cyclic.

Good gun but it is too heavy (22 lbs) compared to lighter guns like MK48. It needs to lose some weight.

G3Kurz
 

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Discussion Starter · #4 ·
The MG 121 is (also) intended to replace the MG3 as a secondary gun in tanks und RCWS like the FLW100: Produktinformation | KMW

The MK48 is a light gun intended for use by light infantry. I don´t think i have to explain that to you. The MG 121 seems to be a true GPMG, and it´s most serious challenger, the M204/MAG is also one.

HK is MARKETING it to the Bundeswehr as an 7,62mm lMG. But it isn't one. If our armed forces should feel the need for a light 7,62mm MG, they should look somewhere else: MK48, IWI NEGEV NG7 etc... OR HK develops a contender to match these models.
 

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Does anyone know how the service life and MRBF compare for the HK121, Mk48 and MG3?
IIRC the parts replacement cycle on a Mk48 is drastically shorter than a M240. Numbers popping in my head are 15,000 before bolt replacement and 50,000 on the receiver compared to 100,000 for both on the M240....I might be completely off, it's been a while. I mean, I can't imagine the Mk48 receiver having the same life as the M249 (Minimi for our Euro friends).

I imagine the HK121 is similar to the M240.

About the video:

I always like when they dunk the hot barrel in the water. I can't imagine that's very good for it though! Perhaps that's why he dunked it slowly.
 

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The hot barrels are dunked slowly for video effect - looks and sounds better, AND prevents you from getting a blast of scalding hot water/steam in your face and/or in the camera.

It does not hurt these HK CHF barrels at all. It is a common method of cooling at HK during endurnace testing. The first MG4's tested at Yuma had the barrels dunked after each firing cycle and we fired 102,000 rounds through a single MK4 prototype using a single barrel that had been "dunked" dozens of times. In my HK21E demos I would fire a single continuous 500 and even 1000 round belt cyclic, remove it w/o a glove, dunk in it water, reinstall it, mount an optic, load match grade ammo and shoot @ 1 MOA groups at 100 meters all day long, and I did this with the same barrel for years. No one makes military-grade barrels like HK.

G3Kurz
 

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In my HK21E demos I would fire a single continuous 500 and even 1000 round belt cyclic, remove it w/o a glove, dunk in it water, reinstall it, mount an optic, load match grade ammo and shoot @ 1 MOA groups at 100 meters all day long, and I did this with the same barrel for years. No one makes military-grade barrels like HK.
That's incredible. I imagine most barrels would suffer some sort of distortion or complete failure if subjected to that.
 

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Does anyone know if HK is going to offer the HK121 at a lower unit cost than the M240 since the HK121 was designed to compete against the proven M240?
 
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