These work great! I now own six of them and plan on purchasing more. No bigger than the Glock 2 extensions, use Wolff 10 springs and don’t tear up the plastic “ears” on the magazine when installing them like some other aftermarket extensions. Only thing I would change is the FDE is more khaki. I also run the micro comp FDE PVD on my 19X and the two colors aren’t even close. Color is the least of my concerns though so I keep buying them. Great product from a top notch company!