The Advantage Arms LE26-27 .22LR Conversion for Glock pistols will fit (GEN 1-3 Only) models 19, 23, 25, 32. Please note Advantage Arms Conversion Kits are made to work on Factory Stock Glock Frames Only. Additionally aftermarket parts such as trigger bars and connectors, especially the Ghost Connector, can adversely affect the function and reliability of your conversion kit.The Advantage Arms Conversion Kit allows a user to shoot inexpensive .22 Long Rifle ammunition with their existing Glock Factory Lower. This is excellent for recreational shooting as well as beginners. These kits are a great tool for teaching women and young adults how to safely shoot a pistol without the intimidation of larger calibers and additionally are ideal for law enforcement training. Advantage Arms has noted several exclusive features and great reasons for choosing their conversion kits. To begin the front and rear sights are removable Glock style sights and include an adjustable rear sight for both windage and elevation. Next the slide will lock open after the last round in the magazine has been fired. The unique patented magazine design and heat-treated steel lock open insert allows this special and desirable feature which you can only find on 'Advantage Arms' .22LR Conversion Kits for the Glock pistol. Glock incorporated an internal firing pin safety into their guns therefore Advantage Arms thought it was important enough to include it in their conversion kits as well. The internal firing pin safety is designed to eliminate accidental discharges from dropping the firearm. All Aluminum parts are Anodized Per Mil-A-8625 with a matte black finish. All steel parts are heat treated with a Black Oxide Finish. The barrel is made from heat treated 416 Stainless Steel. These finishes mean a durable and clean appearance which will last through use after use. Next Advantage Arms has made their kit to install and be ready for use within 10 seconds with some practice. Installation is simple and does not require any modifications to your Glock pistol. Simply remove the Glock magazine and slide as outlined in your Glock owner's manual. Now slide the "Advantage Arms" slide onto the frame, until it engages with the slide lock. Check to make sure that the slide lock is in its most upward position. Insert the conversion magazine. You are now ready to shoot. Lastly Advantage Arms kits are covered under warranty against defects in the materials or workmanship. Advantage Arms highly recommends Remington "Golden Bullets" for everyday plinking and CCI MiniMags or Federal Automatch for better accuracy.