The grau 5.56 from Warzone in is best versions in my opinion.
With barrel tempus 26.4" Archangel and 50 round mags.
You can find some upgrade on my account.
Size: 90cm
Look carefully at the pictures for assembly, especially at the 3 parts of the barrel.
Connector hard: They hold well but are difficult to fit in.
Connector light: They hold little but are easy to fit in. Practical if you want to align the parts to stick them.