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Sig Sauer
Running low on rounds mid-string at the range or in a defensive scenario isn't an option. The Sig Sauer P320/M17/M18 9mm Luger 21-round extended magazine lets you shoot longer between reloads while maintaining the same rock-solid reliability you get from factory Sig magazines. Built to the same exacting standards as the magazine that came with your pistol, this steel-bodied mag is engineered for shooters who demand confidence in their equipment—whether you're training hard or carrying serious capability.
This 21-round extended magazine works seamlessly with P320 full-size platforms, including the M17 and M18 variants. The high-lubricity finish ensures smooth feeding cycle after cycle, while the high-tensile spring delivers unmatched reliability and long service life. A removable base plate makes field maintenance straightforward, and witness holes marked in 5-round increments let you see exactly how many rounds remain at a glance—no guessing during competition or training.
The steel construction and durable polymer follower are built to handle serious use. If you're running a P320 and want the flexibility to keep more rounds in the mag tube, this extended option gives you factory-grade performance without compromise.
| Brand | Sig Sauer |
| Firearm Compatibility | P320, M17, M18 (9mm Luger) |
| Capacity | 21 rounds |
| Material | Steel body, polymer follower |
| Finish | Black/Coyote Steel |
| Base Plate | Removable |
| Witness Holes | Yes, in 5-round increments |
Yes. This extended magazine is compatible with P320 full-size platforms, including the M17 and M18 variants chambered in 9mm Luger.
This is a factory Sig Sauer magazine built to the same reliability and quality standards as the magazine that shipped with your pistol.
Yes. The base plate is removable, making field maintenance and cleaning straightforward.
The magazine features witness holes marked in 5-round increments along the side, allowing you to see the remaining round count at a glance.
Sig Sauer
Running low on rounds mid-string at the range or in a defensive scenario isn't an option. The Sig Sauer P320/M17/M18 9mm Luger 21-round extended magazine lets you shoot longer between reloads while maintaining the same rock-solid reliability you get from factory Sig magazines. Built to the same exacting standards as the magazine that came with your pistol, this steel-bodied mag is engineered for shooters who demand confidence in their equipment—whether you're training hard or carrying serious capability.
This 21-round extended magazine works seamlessly with P320 full-size platforms, including the M17 and M18 variants. The high-lubricity finish ensures smooth feeding cycle after cycle, while the high-tensile spring delivers unmatched reliability and long service life. A removable base plate makes field maintenance straightforward, and witness holes marked in 5-round increments let you see exactly how many rounds remain at a glance—no guessing during competition or training.
The steel construction and durable polymer follower are built to handle serious use. If you're running a P320 and want the flexibility to keep more rounds in the mag tube, this extended option gives you factory-grade performance without compromise.
| Brand | Sig Sauer |
| Firearm Compatibility | P320, M17, M18 (9mm Luger) |
| Capacity | 21 rounds |
| Material | Steel body, polymer follower |
| Finish | Black/Coyote Steel |
| Base Plate | Removable |
| Witness Holes | Yes, in 5-round increments |
Yes. This extended magazine is compatible with P320 full-size platforms, including the M17 and M18 variants chambered in 9mm Luger.
This is a factory Sig Sauer magazine built to the same reliability and quality standards as the magazine that shipped with your pistol.
Yes. The base plate is removable, making field maintenance and cleaning straightforward.
The magazine features witness holes marked in 5-round increments along the side, allowing you to see the remaining round count at a glance.
