KAK Industry AR-15 DBC Bolt Carrier Phosphate Black. There is a floating weight in the carrier tail which has a dead blow effect eliminating bolt bounce and providing enough weight for the FRT to function as intended. KAK Industry have tested this successfully with the Hoffman Tactical Super Safety AS Designs ARC fire FRS Atrius Development FRS and Rare Breed FRT. Similarly designed product should work as well. Phosphate coating and chrome liningprovides a BCG with excellent protection against wear and corrosion making it a popular choice for those seeking reliability and longevity in their firearms. The phosphate coating provides an initial layer of protection while the chrome lining offers additional durability and resistance to the stresses of repeated firing. Specifications for KAK Industry AR-15 DBC Bolt Carrier: Manufacturer: KAK Industry Color: Black Finish: Phosphate Caliber: 5.56x45mm NATO .300 AAC Blackout Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Additional Features: Standard Condition: New Cam Pin Material: 4140 Steel Carrier Material: 8620 Steel Weight: 12.5 oz Features of KAK Industry AR-15 DBC Bolt Carrier: M16 Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel Properly Heat Treated Ground to Perfection chrome lined phosphate finish 4130 Gas Key chrome lined phosphate precision staked using our hydraulic staking machine KAK Carrier Key Screws- T25 drive Grade 8 Properly Heat Treated Package Contents: KAK Industry AR-15 DBC Bolt Carrier What firearm models does the manufacturer say KAK Industry AR-15 DBC Bolt Carrier is compatible with? The manufacturer suggests that KAK Industry AR-15 DBC Bolt Carrier is compatible with AR-15KAK Industry MO-204-0412-007: AR-15 DBC Bolt Carrier Phosphate Black