Class 3+ bulletproof vests are popular because they offer protection against the AK-47 Kalashnikov rifle while remaining relatively lightweight. This is a significant advantage if you need to wear the bulletproof vest for extended periods. Consequently, it offers protection against 7.62mm lead-core rifle bullets, as well as 7.62x39mm MSC AK47 ammunition, which is most commonly used by terrorists or in certain war situations.