Because in my opinion, They suck and are prone to failure just like the locking blocks of the Barrettas. Once again, That's MY OPINION. Just like it is of your opinion that they are great reliable weapons. As I said in my earlier posts, There are a lot more instances of Glocks blowing up than any other weapon out there with Barettas coming in second for catistophic failures. I've also acknowledged that the S&W sigma series were pieces of shit and notorious for double feeds and jams. I get it, You like glocks and they work for YOU. More power to you. Through my experiance and research, glocks Don't work for me so, I've found another weapon system that works for ME.