Our Super2 +2 magazine extensions are the only Glock +2 extensions that will not fall off. They have an "L" shaped insert that locks the +2 bottom plate in place. The Super2 is designed for pre-ban fully metal lined (FML) hi-capacity mags designed to fit G20 10mm mags and G21 .45cal mags.
Specifications and features:
Fits Glock 20 and 21 magazines
Adds 2 rounds
Recommended for use with an extra power magazine spring