This deserves separate post.
EVERY. FUCKING. IRONSIGHT IN BATTLEFIELD 4 (Including China Rising).
Sidearms
Shotguns
DMRs
Carbines
Assault Rifles
PDWs
LMGs
Bolt-Action Rifles
Sights x1-x4
US
ACOG, M145
RX01 Reflex, EOTech552
RU
CN
JGM4, PRISMA
Coyote, HD33
Thermal
FLIR, IRNV
Pistol
Scopes x6-x40
#notes
Serbu Super Shorty belongs both to Sidearms and Shotguns
Almost every BARifle has shared ironsights (most of them have generic US irons, SRR61 has same iron's as PDWR IIRC, SV98 has its own sight.