WTS: Glock 21 mags for sale or trade. 1.Two 13 rd. mags 45ACP for Glock 21. Each $35 shipped. or will trade for 2 glock 20 15 rd. mags even. 2.Two 25+ Glock 21 Mags (13 rd with KRISS adaptor with extra original Glock springs and mag. insert for G-21 each 25+ rd. mag). Each 25+ mag $ 75 shipped. You buy all 4 mags $200 shipped. USPS MO.