This is genuine .50 cal BMG ( 12.7 mm ) NATO round converted into bottle opener. The cartridge will last forever. Ideal as a gift, a very unique gift. Powerful item. Initial projectile speed is around 1000 m/s. Designed as anti matériel round and to combat light armoured vehicles, penetrating concrete walls, low level flying planes etc. This calibre is a standard NATO diameter and in use by US, UK, and most European Armies. Will post via Royal Mail or collection in person available from London Waterloo. Any questions please send a message via EBay. Thank you.