@BillW,
The 33 round Glock magazine is not extended - it comes that way from the factory.
A mag extension is an aftermarket modification that increases the magazines capacity above and beyond factory specs.
The Muslim terrorists that shot 43 people, killing 13 at Ft. Hood used pistol magazines that had been extended.
Side note: Hasan bought a laser-equipped semiautomatic handgun and repeatedly visited a firing range, where he honed his skills by shooting at the heads on silhouette targets before he attacked.
