JE Machine Tech A2 Buffer Tube .223 or .308 Rifle Length Black. 223/.308 Rifle Length Buffer Tube: Manufacturer: JE Machine Tech Color: Black Fabric/Material: 6061-T6 Aluminum Gun Model: AR-10 AR-15 Condition: New Features of JE Machine Tech A2 .223/.308 Rifle Length Buffer Tube: Full length tube Great fit for all AR rifles Constructed from 6061-T6 Aluminum Compatible with 308 or .223 buffer Package Contents: J&E Machine Tech A2 .223/.308 Rifle Length Buffer Tube What firearm models does the manufacturer say JE Machine Tech A2 .223/.308 Rifle Length Buffer Tube is compatible with? The manufacturer says that JE Machine Tech A2 .223/.308 Rifle Length Buffer Tube is compatible with AR-15 AR-10JE Machine Tech PS-BTA: A2 Rifle Length Buffer Tube for .223 or .308 Black