SIG's 5.56 HYP 97gr Tungsten AP projectile shows a novel 'tandem warhead' design, where a front tungsten cylinder is designed to shatter the ceramic, while a follow on pointed penetrator is designed to then punch through this weakened area. May be the key to defeating Level IV.
A modular medium machine gun combining M240B firepower with 1960's West German sex appeal, the HK21E (for "Export"') was meant to round out HK's roller-delayed catalogue with a true rifle-caliber belt-fed.
However, HK's best machine gun also proved to be their worst, and attracted very little interest, remaining obscure at best.
Pictured: artwork depicting Operation: Sunburst, the battle between the NCR and the Brotherhood at HELIOS One. This art comes from the New Vegas Setting Guide for Fallout: The Roleplaying Game by @Modiphius, and was created by artist Wilmar Ballespí. #Fallout