The Small Arms Protective Inserts (SAPI) upgrade the OTV to provide additional protection from rifle-fired threats.
The Enhanced Small Arms Protective Insert (ESAPI) when placed in the Outer Tactical Vest pocket of the multiple threat/Interceptor body armor will provide ballistic protection from specific 5.56 mm and 7.62 mm ball and AP rounds.
The Enhanced Side Ballistic Insert (ESBI) plates provide additional coverage as they protect the wearer's sides between the Enhanced Small Arms Protective Insert (ESAPI) plates worn inside the front and rear, and provide the same ballistic protection as the ESAPI.
The Enhanced Side Small Arms Protective Insert (S-SAPI) and ballistic carriers provide increased side torso protection for Marines.
The X Small Arms Protective Inserts (XSAPI) have tan covers and provide greater protection than the ESAPI for the chest and back.
The X Side Ballistic Inserts (XSBI) have tan covers and provide greater side protection than the ESBI.