Does anyone know where i can find Magazines OVER 15 rounds for my 10mm GLOCK 20?
There is no demand for magazine capacity over 15 for the 10mm. Few realize that large capacity magazines stress your magazine retention parts inside your weapon by increasing the weight beyond what the parts were designed for. The 10mm is usually possessed by people who are serious about defense and hunting who will never create a demand for magazines that are impossible to carry in a holstered weapon.
