The Agency Arms SIG P320 +5 Base Pad is designed to enhance your 17rd magazine capacity by adding 5 rounds for 9mm and 4 rounds for .40 S&W and .357. This base pad is precision machined from 6061 aluminum and features a hard anodized finish for durability. Compatible with both the Agency Arms X-Series Magwell and the factory SIG magwell, this base pad also includes an extended ledge for one-handed manipulations, making it a practical upgrade for shooters looking to maximize their magazine's potential. Proudly made in the USA, this base pad is a reliable choice for responsible gun owners and enthusiasts alike.