Warne 9mm / 40 +5 / +4 Magazine Extension for S&W M&P

The WarneA(R) 9mm / 40 +5 / +4 Magazine Extension for S&WA(R) M&PA(R) - Black allows you to add a few more rounds to your M&P magazines so you can be sure you have enough rounds for any situation. Featuring lightweight and durable aluminum construction with a hard coat anodized corrosion-resistant finish, this magazine extension provides an additional layer of shock resistance and durability to your factory M&P magazines. Plus, this extension gives you +5 rounds for your 9mm magazines and +4 rou