KAK Industry AR-15 BCG M16 Profile 5.56 K-Spec Carpenter 158 Black Nitride

The KAK Industry K-Spec Bolt Carrier Group delivers reliable function in direct impingement AR-15 rifles chambered in 5.56 NATO/.223 Remington. Built to M16 profile specifications with a full-auto carrier, this BCG provides consistent carrier mass for proper cycling across a range of ammunition weights and buffer configurations. The extended carrier tail design helps improve reliability in carbine-length gas systems.

Manufactured from Carpenter 158 steel with proper heat treatment and shot-peened bolt, this BCG features a black nitride finish on all components for improved lubricity and corrosion resistance. The nitride coating reduces friction and simplifies cleaning compared to phosphate finishes. Gas key is secured with Grade 8 fasteners and properly staked. This is a drop-in replacement part requiring no fitting or modification for mil-spec AR-15 upper receivers.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15 rifles, 5.56 NATO/.223 Remington
• Material: Carpenter 158 steel bolt, 8620 steel carrier
• Finish: Black nitride
• Profile: M16 full-auto carrier
• Installation: Drop-In
• Includes: Bolt carrier, bolt assembly, cam pin, firing pin, firing pin retaining pin