Cloak Industries Carbine Buffer Tube Black. Perfect for use with the MFR56 belt fed upper receiver or your new AR-15 build. This buffer tube possesses a buffer retainer cutout to ease the assembly process and prevent the accidental loss of your buffer retainer plunger and spring during takedown or maintenance. Specifications for Cloak Industries Carbine Buffer Tube: Manufacturer: Cloak Industries Color: Black Finish: Anodize Fabric/Material: 6061 Aluminum Gun Make: AR Platform Gun Model: AR-15 Package Contents: Cloak Industries Carbine Buffer Tube What firearm models does the manufacturer say Cloak Industries Carbine Buffer Tube is compatible with? The manufacturer says that Cloak Industries Carbine Buffer Tube is compatible with AR-15Cloak Industries CLK-CBT-BLK: Carbine Buffer Tube Black