The Strike Industries Aluminum Extended Magazine Plate for SIG SAUER P320 (9mm) is masterfully crafted to seamlessly fit 21, 17, and 15-round SIG SAUER P320 magazines. Offering an additional plus 5 rounds for 9mm, it's machined from sturdy 6061-T6 aluminum to ensure a durable construction that can handle the rigors of consistent use. You'll find it simple and intuitive to install, thanks to its adaptable secure design fitment. At 1.97oz, the Strike P320 EMP boasts a slim, low drag, no snag design that not only enhances its aesthetics but also optimizes its performance. Its dimensions also comply with USPSA rules making it an excellent choice for competitive shooting. Plu Mfg: Strike Industries