Strike Industries Sig Sauer P320 (9mm) Aluminum Extended Magazine Plate - Black - The Strike Industries Aluminum Extended Magazine Plate for the SIG SAUER P320 (9mm) is precision-machined from durable 6061-T6 aluminum and designed to fit 15-, 17-, and 21-round P320 magazines, providing an additional 5 rounds of capacity. Featuring a secure, user-friendly installation and a lightweight 1.97 oz construction, its slim, low-profile, snag-resistant design offers a clean appearance and reliable performance. Designed to comply with USPSA regulations, this extended magazine plate is an excellent option for competitive shooting and everyday range use. Available in anodized SI BLACKLINE and FDELINE finishes, it combines durability, functionality, and style. 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;