Having extra rounds in your mag can be a life-saving factor in self-defense and tactical situations. The FAB Defense 4 Round Magazine Extension for Glock 43 is a magazine floor-plate replacement that adds 4 extra rounds to your arsenal for a total of 10 rounds. The ergonomic design of these Pistol Magazine Extensions by FAB Defense allows secure manipulation of the magazine and a full grip on the weapon when you use it, due to the contoured finger indents on the extension. Another helpful feature of this FAB Defense 43-10 Glock Magazine Extension is the innovative spring plate design that allows for the use of your original magazine spring, requiring no further parts or modifications. From military applications to home defense, the FAB Defense Glock 43 Tactical Mag Extension is an excellent addition to your Glock while giving you extra peace of mind, and four extra bullets, which just might save your life. Specifications for FAB Defense 4 Round Magazine extension for Glock 43: Manufacturer: FAB Defense Fabric/Material: Polymer Magazine Capacity: 4 Round Gun Make: Glock Gun Model: Glock 43 Features of FAB Defense 4-Round Magazine Extension for Glock 43, 1S0-MZX-43-10: Glock 43 only. Enables a full grip on the handgun. Contoured finger indents for a firm grip during magazine manipulation. Innovative spring plate allows the use of the original magazine spring. Fiberglass reinforced polymer construction. + 4 rounds for a total of 10 rounds in the magazine. Package Contents: FAB Defense 4-Round Mag Extension, Glock 43, 1S0-MZX-43-10 What firearm models does the manufacturer say FAB Defense 4 Round Magazine extension for Glock 43 is compatible with? The manufacturer says that FAB Defense 4 Round Magazine extension for Glock 43 is compatible with Glock 43