Luth-AR Luth-AR Stainless Steel Gas Tube - Fits AR-15 Gas Tube Specs: Material: 304 Stainless Steel Army Spec Heat Treatment Tube Length: Rifle Length gas tube OAL 15 3/16″ SKU: BL-04 Mid Length gas tube OAL 11 3/4″ SKU: BL-04C Carbine Length gas tube OAL 9 3/4″... MSRP: Was: Now: $12.68 - $16.44 Choose Options