The SIG SAUER P320 9mm 21‑Round M17/M18 Magazine is an extended factory magazine designed to increase capacity and reliability for duty or range use. Built to SIG SAUER’s high standards, it provides smooth feeding and dependable performance.
This 21‑round extended magazine is designed for the SIG SAUER P320‑M17 and P320‑M18 pistols and also fits full‑size P320 models. It is compatible with P320 pistols equipped with the factory magwell and P211 models with the magwell installed, making it a versatile option for shooters who want additional capacity.
Constructed from durable steel with a high‑visibility follower and extended baseplate, this magazine ensures reliable operation while providing increased round capacity for extended shooting sessions.
- 21‑round extended capacity
- Designed for SIG SAUER P320‑M17/M18 pistols
- Compatible with full‑size P320 models
- Works with P320/P211 pistols with factory magwell installed
- Durable steel magazine body
- Extended baseplate for increased capacity
- Factory SIG SAUER magazine for reliable feeding
