Survivability is improved in the addition of assorted modular armor defense techniques for equally the M60's turret and hull. The upgrades involve armor safety with STANAG 4569 Level 6 protection plates into the frontal arc, passive and reactive armor panels and facet skirts and slat armor extra for the bustle, https://hoytmachineguns.com/product/lot-3427-bergmann-mp35-1-class-iii-nfa-cr-fully-transferable/