I. Izhmash VS-121 (srifle_DMR_01_F) and Mk.14 EBR (srifle_EBR_F) have broken zeroing. PSO and mil-dot optical sights are (almost) useless at 800-1200m range.
II. Izhmash VS-121 (srifle_DMR_01_F) and Mk.14 EBR (srifle_EBR_F) have broken zeroing with sound suppressors. Take SOS and 7.62 sound suppressor and try to shoot some targets at 1000-1200m. You'll never hit them.