Level 4 / Level IV is the highest rating for body armor. They are designed to protect against all lower levels as well as against .30 caliber "armor piercing" rounds. Looking for Level 4 SAPI plates for sale? Find them here.
Crye Precision CAGE Armor Chassis System with level IV 4 Multi hit Plates
Level IV 4 Hard Armor Alumina Ballistic Plate up to 6 Bullet Proof Best Quality
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