Ultimate Arms Gear Enfield Rifle Scope Sight Model .303 NO.1 MK3 Weaver Rail Mount Enfield Rifle Scope Sight Model .303 NO.1 MK3 Weaver Rail Mount The Enfield .303 No.1, Mk.3 Mount Will Only Fit that Model Specifically (Does not fit .308). Mount is Made from Black T-6 Aluminum Alloy and Will Provide a Weaver 7/8" Style Rail to Accept Scope Rings or any Other Weaver Based Accessory. The Mount is Extremely Durable and Stable and Will Hold Zero.