Junk, and here’s why - Tyrant CNC 5 Round Magazine Extension for Glock

Yea this part looks good and is made of aluminum, appears to be solid quality. But the inside edges on the channels that slide over the bottom of the magazine are razor sharp and not deburred. It slices into the polymer creating gouges, and causing a rocking side to side motion of about a millimeter. Otherwise I guess it’s not bad.