The Amend2 17-round magazine is designed for use in the GLOCK 17 and is a sturdy reliable 9x19MM magazine made of an advanced polymer material. It is a light durable and excellent alternative to the standard GLOCK OEM magazine. This magazine has Amend2's unique baseplate to truly make it one of a kind. Features: 17-round magazine. Sturdy impact resistant polymer for increased strength. Heavy duty non-memory and non-corrosive spring. Made in the U.S.A.