HK G41, a roller delayed blowback chambered in 5.56x45mm like the HK33 but has extra features:
Ultimax 100, a Singaporean LMG notable for its usage of the constant recoil system:
The Stoner 63s, the first an AR and the second is a Carbine:
The Rheinmetall-Steyr RS556, one of the competitors to replace the G36:
And finally, the XM29 OICW:
Any mistakes, please point them out!