carlson1 wrote:The Old G21 can take old & new mags while the New G21SF can only take the new mags with the extra slot along the front of the mag. The new mags also have the mag catch/release grooves meant for the old G21.
Glock is only making one G21 mag - and they work for both styles of G21.
Old Mags will NOT work in the new G21SF as they do not have the correct mag catch/release groove...
Actually there are G21sf models that can use the old mags. Glock made some G21sf models with the now discontinued Ambidextrous Mag Release and others that use the old style traditional mag release (I own both models of G21sf). So when buying a G21sf you need to determine what style mag release it uses to be sure what mag will work.
