@ Andreas: I would like to know the specs as well but none have surfaced so far. The gun was built to compete with MG's like the FN MAG / M240 - so I guess it won't be superlight since it must be able to handle a high volume of fire and still have long service life with no parts breakages. HK has learned quite a lot about mgs in recent years (MG4, UK gpmg ) - so I guess we can assume it's just as reliable (or more) as the competition.
Is this supposed to be a GPMG o a 7.62 LMG, like the Mk. 48?
In the beginning there was some talk that HK and the Bundeswehr considered designing a true 7.62 LMG for dismounted infantry ala' PKM / Pecheng (all rumors mind you ). Eventually the Bundeswehr wanted a real bullet-hose - so far there is no info on how much the HK 121 wheighs. That would answer some questions about how this gun would / could be used.
AFAIK the weight of the prototype shown in Hammelburg was 10,8 kg.
Ahhh thank you!
10,8 kg - pretty much the same weight as the M240. It seems HK is trying to compete against the FN Mag / M240 rather than the Mk 48. It makes sense with both the UK and France looking to replace their old GPMG's.
Maybe they'll build a lighter PKM-style gun someday....