JE Machine Tech AR-10 Lower Vise Block .308 Black. 308 Lower Vise Block: Manufacturer: JE Machine Tech Gun Model: AR-10 Caliber: .308 Winchester Color: Black Condition: New Projectile Caliber: .308 Caliber Features of JE Machine Tech .308 Lower Vise Block: Locks into the lower receiver of AR-10 Rifles Perfect for repairs service or weapon assembly Will not crush distort or mar the receiver Package Contents: J&E Machine Tech .308 Lower Vise Block What firearm models does the manufacturer say JE Machine Tech .308 Lower Vise Block is compatible with? The manufacturer says that JE Machine Tech .308 Lower Vise Block is compatible with AR-10JE Machine Tech TS-GT7B: .308 Lower Vise Block Black