http://www.thefirearmblog.com/blog/2017/02/03/news-heckler-koch-hk433/
Breaking: News from Heckler & Koch – HK433 A New Rifle!
...
It was shown to a very selected number of people at SHOT Show and Heckler & Koch just ran an ad in the German magazine “Europäische Sicherheit & Technik” nr 2 (2017).
...
The HK433 uses the NATO standard 5,56 mm x 45 mm and a short-stroke piston, but the system is prepared for other calibers like 7,62 mm NATO and .300 Blackout as well as 7,62×39 Kalashnikov.
The source (Europäische Sicherheit & Technik) mentions that the 7,62 mm NATO version will be called HK231.
I guess we will find out more with time, but if the HK comes with 7,62×39 Kalashnikov – called HK123 – it could be very interesting for a few armies even within NATO. As recently reported, Ukraine are having some issues finding a way to live with both NATO and former East bloc ammunition and rifles.
...
Some of the competitors to the HK433 are as follows: C.G. Haenel/Caracal CAR 816, Colt Canada/Diemaco C8SFW, HK416 A5 (G38), LWRCI M6-G, Schmeisser M4, IWI X95, Rheinmetall/Steyr-Mannlicher RS556, SIG Sauer SIG MCX, Swiss Arms SG 553, Thales F90, Beretta ARX-160, B&T APC556, CZ BREN 2, FN Herstal FN SCAR-Light and FB Radom MSBS.
...
The “Optional receiver integrated maintenance free shot counter” is automated translation at work, and most likely is a battery-free shot counter placed inside the lower. This makes it easier to judge a maintenance situation and also give valuable feedback, as a digital logbook. FN Herstal has a similar system.
UPDATE; RIFLE IS CALLED HK433 – Just got this from a buddy in Germany; he says the HK416 is too expensive for the German Army so HK has developed this rifle as a potential new service rifle. He called it the HK ‘Masada’ as it very much resembles the Magpul Masada – which is very interesting in that the Masada was inspired to some degree by the HK XM8