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. Glock 21 and 21SF magazines hold 10 rounds as standard capacity.
Specifications and Features:
Fits: All Glock 45ACP caliber models. ( will not fit flush on compact models but will function)
NOTE: All current production Glock magazines are also compatible with all previous generations of Glock pistols.