Utilizing the magazine extension technology the Tyrant Designs magazine extension For Glock 19 & 23 is the fastest and easiest installing mag extension ever! Why do they install so quickly? Tyrant Designs use a retention plunger that allows the magazine extension to easily slide onto the bottom of your magazine! The entire install happens in 10 seconds or less and with no tools! Want to take it off? Easy, just push the plunger down and slide the magazine base plate off! Their magazine base pads are CNC machined from aerospace grade aluminum. This gives any operator the added weight needed for your base pad to drop free and fast. The mag extensions instantly add 5 rounds to your 9mm Glock 19/23, and 4 rounds to your .40 cal 19/23. With an added knurl their mag extension is easy to grasp in any conditon, making reloads faster than their competitors.As always, their products are manufactured in the USA and have a flawless finish. There is no easier and quicker way to add the much needed capacity to your Glock 19 or 23 than with our Glock magazine extension. Whether you are an avid concealed carrier, an active competitive shooter or anything in-between, their Magazine Extension is the solution! Purchase includes new power spring Quickest installing Magazine Extension EVER Adds 5 rounds of 9mm Adds 4 rounds of .40 Added control and increased purchase Smooth chamfered edges NO TOOLS NECESSARY!