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When the Glock 21SF was first introduced in 2007, Glock management thought there might be upcoming pistol trials for the US military. The Beretta 92 pistol won the last military pistol trials in 1985.
Rumors that the military might be considering a transition back to the more powerful .45 ACP cartridge coupled with the possibility of upcoming trials led Glock to offer the Glock 21SF (with SF standing for “Short Frame”).
In preparation for the potential military evaluations, many of the first series of G-21SF models were built with a 1913 picatinny rail instead of the standard Glock rail. The Beretta 92 utilizes the standard 1913 picatinny rail so Glock wanted the evaluation pistols to utilize the same rail.
Although there aren’t that many of these models with the picatinny models in circulation, SF models with the 1913 picatinny rails won’t fit in a holster built for a G21SF with Glock rails. They require a holster specifically molded for the picatinny railed series.
Holsters listed on this page will fit the Glock 21SF series with a 1913 picatinny rail.