The best magazine for your Heckler & Koch VP40 or P30 .40 S&W is an OEM HK Factory 10 Round Magazine
The Heckler & Koch Magazine is a standard factory replacement magazine. This magazine is for P30 and VP40 models chambered in .40 S&W and it holds 10 rounds of ammunition. It is made from high quality alloy. The exterior of the magazine features a matte black finish, and the magazine features a flush fit design which does not extend past the base of the pistol's grip. Additionally it is worth noting that the magazine is made to Heckler & Koch's specifications and tolerances, using the same manufacturing process and materials as the original equipment magazines which shipped with your firearm. This will ensure not only a perfect fit but exceptional operation.
Heckler & Koch Factory Magazine Specifications and Features : HK Item Number: 50259079