An extended 20-rd magazine for the Springfield Armory Inc. XD pistols in .40S&W. Constructed from heat-treated blued-steel with a follower lock-plate and base-plate molded from a proprietary DuPont Zytel based black polymer; and using a spring wound from Chrome-silicon wire and heat-treated for strength and reliability. This magazine has an o/a length of 8.125inches. Made in the U.S.A.