Wilson Combats 1911 magazine has proven inherent reliability durability and the ability to remain fully loaded for long periods of time without damage. The magazine springs are specially fabricated from the highest tensile strength heavy duty spring for long service life enhanced feeding and positive slide stop operation. It is manufactured from aircraft grade certified stainless steel and heat treated for maximum durability and service life.This model has a stainless steel finish and a lowprofile steel base pad. It is also used for 45ACP P rounds.