These are factory original, drop-free magazines for your factory Glock handgun. Specifically designed for the Glock 29, the Glock 29 extended mag and Glock 29 10mm magazine offer more capacity for your shooting needs. Factory Glock magazines, including the Glock 29 10mm extended mag, have a hardened steel insert encased in high-tech polymer. This innovative design and the use of polymer ensure durability and make the Glock 29 extended clip resistant to wear and tear. This polymer coating protects the magazine and prevents deformation, even when dropped from a great height. Equip your Glock 29 with the best and experience enhanced performance. NOTE: GLOCK MAGAZINES CAN BE VERY DIFFICULT TO LOAD WHEN NEW. OFTEN THE LAST ROUND WILL NOT FIT UNTIL THE MAGAZINE HAS UNDERGONE A BREAK-IN PERIOD. IT IS RECOMMENDED THAT THE MAGAZINE BE LOADED WITH ALL BUT THE LAST ROUND AND LEFT FOR A FEW DAYS TO COMPRESS THE SPRING. CYCLING THE MAGAZINE FROM FULL TO EMPTY MULTIPLE TIMES CAN ASSIST IN THE BREAK-IN PERIOD.