Promag manufactured this parkerized steel magazine for the Springfield Armory M1A tactical rifle, and the M14 rifle.
The maximum capacity for this magazine is 20 rounds. Will only hold .308 Winchester, and 7.62X51mm rounds. The steel housing on this magazine has been parkerized for resisteance towards wear and corrosion.
One characteristic about Promags reputation is the process and dedication that goes into their manufacturing process and that has held true since their conception. This dedication to only turning up superior and dependable products for whatever occasion, has kept their integerty strong and reputation solid for many years.