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. Plus, you can express your style with the available anodized SI BLACKLINE or FDELINE colors. Elevate your shooting experience with this reliable and well-engineered Strike Industries Aluminum Extended Magazine Plate for SIG SAUER P320 (9mm). COMPATIBILITY: OEM SIG SAUER P320 magazines: 21-round w/ included SI magazine spring 17-round use w/ SIG OEM magazine spring 15-round use w/ SIG OEM magazine spring Most SIG SAUER P320 grip modules SI EMP Pocket Clip NOT COMPATIBLE: 10-round magazines MAY NOT WORK WITH SOME MAGWELLS Aftermarket magazines such as ACT, ProMag, or ETS FEATURES: Fits 21, 17 and 15 round SIG SAUER P320 magazines Machined from 6061-T6 aluminum Plus 5 round capacity for 9mm Simple intuitive installation process Adaptable secure design fitment Slimmest profile on the market (low drag / no snag design) Fits USPSA 140mm race division limit Available in anodized SI BLACKLINE or FDELINE colors PACKAGE CONTENTS: x1 Aluminum Extended Magazine Plate for SIG SAUER P320 (9mm) x1 Extended length spring for 21-round magazine body x2 Set screw (M4x3mm) x1 Hex tool [2mm] x1 Warning card WARNING: The extra power spring included with the Sig P320 Aluminum EMP is designed to be used with the OEM 21 Rd magazine to facilitate the proper function of the P320. However, due to the variations of the internal dimensions common to stamped steel magazines, some magazines will only achieve +4 capacity initially. Please allow time for the magazine spring to break in for +5 capacity. TORQUE: Do not exceed 7 in/lbs (0.79 nM) for the set screws