The Vickers Duty Mag increases reliability in 1911 pistols has a completely sealed construction with rear witness hole that nearly eliminates lip spreading and ingress points for sand and debris. The redesigned follower has sand cuts to reduce friction when dirty or heavily fouled and the new last round detent will solve last round reliability issues in the 1911 design. The heat-treated MAX flatwire construction never gets stressed or over-compressed like a conventional spring and is guaranteed to never require replacement even after high round counts or daily, extreme duty use.