Strike Industries Extended Mag Plate for Sig P320

The Strike Industries Extended Mag Plate for Sig P320 (part no. SI-EMP-AL-P320-BK) is an extended magazine baseplate, not a standalone magazine — it bolts onto compatible Sig Sauer P320 9mm factory magazines (21-, 17-, and 15-round) and adds 5 rounds of capacity. Strike Industries machines it from 6061-T6 aluminum for a durable, low-drag build that stays USPSA-legal. It’s a straightforward way to stretch the capacity of P320 magazines you already own. Whether you’re competing or just want more rounds on tap, this baseplate is built to add capacity without buying new magazines.

Key Specifications

• Fits 21-, 17-, and 15-round Sig Sauer P320 9mm factory magazines.
• Adds 5 rounds of capacity per magazine.
• Machined from 6061-T6 aluminum.
• Finished in black.
• Weighs about 1.97 oz, minimal added bulk.
• Low-drag, no-snag profile designed for a clean draw.
• Dimensions comply with USPSA competition rules.
• This is a baseplate extension, not a standalone magazine.
• Manufactured by Strike Industries.
• Cataloged under our handgun magazines selection at Schaefer Defense.

Frequently Asked Questions

Does this come with a magazine? No — it’s a baseplate upgrade for P320 magazines you already own, not a standalone magazine.

Which Sig P320 magazines does it fit? It fits 21-, 17-, and 15-round Sig Sauer P320 9mm factory magazines.

Is it legal for USPSA competition? Yes, its dimensions comply with USPSA rules.

Buy the Strike Industries Extended Mag Plate for Sig P320

Order the Strike Industries Extended Mag Plate for Sig P320 from our Lubbock, Texas gun shop for fast shipping. Browse more handgun magazines at Schaefer Defense.