The KAK Industry AR-15 Bolt is engineered for reliable performance in 5.56x45 NATO and .300 Blackout chambered rifles with a durable chrome plated finish for enhanced corrosion resistance and longevity.KAK Industry AR-15 Bolt (Model: MO-303-0505-002)Compatible with 5.56x45 NATO and .300 Blackout cartridgesChrome plated finish for corrosion resistancePrecision manufactured for reliable cyclingSKU: 303-0505-002Ideal for AR-15 builds repairs or upgrades requiring a high-quality bolt assembly with multi-caliber compatibility and enhanced durability from the chrome finish.