ProMag COL18 is a 5-round magazine designed for 7.62x39mm caliber AR-15 rifles. Magazine body is heat-treated steel and topped with a black oxide finish for durability and rugged field use. It uses a chrome-silicon wire spring and a precision molded polymer follower to ensure reliable feeding and function. Manufactured and warranted by ProMag. Made in USA.\n\nA 5-rd Magazine for 7.62x39 Caliber AR-15 rifles. Magazine body constructed of heat treated steel with a black oxide finish for durability and harsh use in the field. A Chrome-silicon wire spring and precision molded polymer follower ensure reliable feeding and function. Manufactured and warrantied by ProMag. Made in U.S.A.\n\nCalifornia shipping restriction: Not available to ship to California.