The Sig Sauer P365 X-Macro Extended Magazine is a factory-manufactured accessory designed for use with the P365 series of pistols. It is constructed with a carbon steel body and features a black finish. This specific model provides a 25-round capacity for 9mm ammunition and includes an extended baseplate that aligns with the X-Macro grip module. Sig Sauer P365 X-Macro Extended 9mm 25rd Black Hi-Capacity Pistol Magazine 8901941