The Performance Basepad from Foxbeard Tactical is an anodized aluminum drop-in replacement basepad for Magpul PMAGS with a number of interesting features.
They extend forward from the front strap of the magazine to provide a ledge that aids in manipulations. Their increased weight aids the magazine in dropping free from the magwell. The rear of the basepad is beveled in a way that provides stability when using the magazine as a monopod. It also features dimples that can be used to number magazines or mark them in a unique way to identify them as yours.
Check out the Foxbeard Tactical Performance Basepad.