JL Billet Replacement Barrel Nut Key Seat .308 Black. Specifications for JL Billet AR-10 Replacement Barrel Nut Key Seat: Manufacturer: JL Billet Color: Black Gun Model: DPMS LR-308 Fabric/Material: Stainless Steel Weight: 0.1 lb Mount Type: M-LOK Country of Origin: USA Features of JL Billet AR-10 Replacement Barrel Nut Key Seat Replacement Barrel Nut Key Seat for 308 Free Float Handguard System. Stainless steel key seat replacement for use with JL Billet MLS and MLA 308 M-Lok rail systems. Package Contents: JL Billet AR-10 Replacement Barrel Nut Key Seat What firearm models does the manufacturer say JL Billet AR-10 Replacement Barrel Nut Key Seat is compatible with? The manufacturer suggests that JL Billet AR-10 Replacement Barrel Nut Key Seat is compatible with DPMS LR-308JL Billet JLB-308-KEY: Replacement Barrel Nut Key Seat .308 Black