XTech Tactical(R) MTX Magazine Extension is designed for compatible 10-round Sig Sauer P365 magazines chambered in .380 ACP. The extension increases the compatible magazine capacity from 10 rounds to 13 rounds providing three additional rounds. This configuration features a black finish and is designed specifically for compatible P365 .380 ACP magazine applications.Key Features Designed for compatible Sig Sauer P365 .380 ACP magazines Designed for compatible 10-round magazines Increases magazine capacity from 10 rounds to 13 rounds Provides a +3 capacity increase Magazine extension configuration Black finishXTech Tactical(R) manufactures magazines and firearm accessories with an emphasis on durability reliability and functional design. The company develops components for a variety of popular firearm platforms and uses purpose-selected materials and manufacturing processes. XTech Tactical products are designed and manufactured with attention to consistent fit and dependable operation.