Glock Magazine - Glock 39 - 45 GAP - 6-Round - Polymer Black This is a factory original, drop-free magazine for your Glock. Glock magazines have a hardened steel insert encased in high tech polymer. This polymer coating protects the magazine and prevents deformation, even when dropped from a great height. Price is $19.00 each I have four (4) available. Shipping costs in US only is $4.99 or one or all. Payment via check, money order or Paypal.