KAK Industry K-SPEC Enhanced Bolt Carrier Group Features The KAK Industry K-SPEC Enhanced Bolt Carrier Group retains mil spec dimensions while adding Slotted Angle Carrier Rails often called sand cutters along with a dual ejector system for increased reliability in dirty or sandy conditions. The 5.56 NATO Down Vent configuration redirects gas downward instead of back toward the shooter s face resulting in a quieter less gassy shooting experience whether the rifle is suppressed or not. Machined from 8620 steel in a full auto M16 carrier profile the carrier is properly heat treated and ground to exact tolerances for consistent cycling. A single piece billet machined 4140 extractor phosphate coated for corrosion resistance ensures reliable case extraction shot after shot. Supporting components include a 4340 chrome plated cam pin an 8740 chrome plated firing pin that is precision ground and heat treated and an S7 tool steel ejector and extractor retaining pin for long service life. The 4130 machined billet steel gas key is chrome lined and chrome plated then precision staked and sealed to the carrier to prevent gas leakage over time. Grade 8 carrier key screws properly heat treated keep the gas key firmly attached under the stress of repeated firing. Compatible with AR-15 and M16 platform rifles this K-SPEC Enhanced BCG is a reliability focused upgrade for shooters who demand consistent performance from their rifle. KAK Industry K-SPEC Enhanced Bolt Carrier Group Specifications Manufacturer: KAK Industry Model: K-SPEC Enhanced Bolt Carrier Group Compatible Hosts: AR-15 M16 Caliber: 5.56 / .223 Rem Color: Black Material: Steel Finish: Phosphate Carrier Type: M16 Weight: 0.73 lbs Available At: GrabAGun