Glock 31 Gen 4 Magazine 357 Sig 10-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. Notes:Glock magazines are compatible with previous and current generation Glock pistols. Glock magazines have very stiff springs when new and may be extremely difficult to load to full capacity. It may be necessary to use a Glock magazine loader (genera