Utilizing their magazine extension technology the Tyrant CNC Glock 43x & 48 magazine extension is the fastest and easiest installing mag extension ever! Adds 4 rounds to your factory magazine AND includes a 10% power spring. Drop your mags faster, and grab them easily with their machined inlay!image Why do they install so quickly? they use their retention plunger technology 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. their mag extensions instantly add 4 rounds to your 9mm Glock 43x/48. With an added knurl their Glock 43x & 48 mag extension is easy to grasp in any condition, making reloads faster than their competitors. As always, their products are made in specialized factories and have a flawless finish. There is no easier and quicker way to add the much needed capacity to your Glock 43x & 48 than with their Glock magazine extension.Whether you are an avid concealed carrier, an active competitive shooter or anything in-between, their Glock 43x & 48Magazine Extension is the solution! Purchase includes new power spring Quickest installing Magazine Extension EVER Adds 4 rounds of 9mm Added control and increased purchase Smooth chamfered edges NO TOOLS NECESSARY!