The Superlative Arms direct impingement bolt carrier exemplifies engineering excellence, constructed from durable 8620 steel with a chrome-lined bore meeting military specifications. Enhanced by precision machining and a diamond-like Coating (DLC), it offers increased lubricity, reduced friction and easier maintenance. The design includes a DLC gas key, securely bipoded with Ned Christiansen's OCKS (Optimized carrier Key screws) for superior staking and screw retention. This advanced combination of materials and technology ensures outstanding performance and reliability, making it a vital component for firearm enthusiasts. Left-handed, fully automatic direct impingement bolt carrier Superlative arms produces all carriers internally to meet or surpass military specifications Chrome-lined dark DLC coating The Superlative arms bolt carrier is fully compatible with all AR-15 bolts This kit provides the end user with the flexibility to select a bolt that aligns with their preferred cartridge