ProMag .308 Win. / 7.62x51mm, 20 Round Blue Steel Magazine for Springfield Armory M1A and M14 rifles. The magazine body and follower are constructed from heat-treated blued-steel for ensured durability and long service life. The magazine also has a parkerized finished for durability and harsh use in the field. If you're looking for a durable and reliable magazine for your Springfield M1A and M14 rifles, then purchase this ProMag magazine!