The Amend2 18 round magazine designed for use in the GLOCK 17 and is a sturdy reliable 9x19MM magazine made of advance polymer material. It is a light durable and excellent alternative to the standard GLOCK17 OEM magazine. This magazine has Amend2's unique baseplate to truly make it one of a kind. Features :Sturdy Impact resistance polymer for increased strengthHeavy duty non-memory and non-corrosive springMade in the U.S.A.