SPR-A2 An 11-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. - See more at: http://promagindustries.com/springfield-inc/186-xd-40-40sw-11rd-blue-steel-magazine.html#sthash.D91oTIFA.dpuf