This extended mag base pads allows for 2 extra 9mm rounds to be loaded into your M&PA(R) magazine, without any other changes. Works great in combination with the Ed Brown Magwell for M&PA(R), but can also work alone. These base pads add a level of protection to your M&PA(R) magazine, while giving you a better gripping surface for easier manipulations under the stress of competition or self-defense. The profile is just aggressive enough to ease handling, without making it uncomfortable to control. Fully machined from aluminum and anodized for a lifetime of service. NOTE: Some states limit magazine capacity. If you are a resident of one of these states, we are unable to Mfg: Ed Brown