ProMag SIG P320 21rd Magazine Blued Steel

This ProMag replacement magazine is designed for the Sig Sauer P320 chambered in 9mm. It offers a 21-round capacity in a heat-treated steel body with a blued finish. The magazine uses an injection-molded follower and a spring formed from heat-treated chrome-silicon wire. Built in the USA for use with centerfire pistols, it serves as a reliable spare for range, training, or duty applications.

Key Specifications

• The magazine capacity is 21 rounds.
• Chambering/Caliber compatibility is 9mm.
• The magazine body material is heat-treated steel.
• The finish is blued.
• This magazine fits the Sig P320 platform.
• The follower is an injection-molded design.
• The spring is formed from heat-treated chrome-silicon wire.
• Country of manufacture is USA.
• The listed weight is 0.25 (unit as provided).
• Overall dimensions (as provided) are 1.25 x 2.30 x 6.85.

Durable blued-steel construction combined with a precision wound chrome-silicon spring and an injection-molded follower provides practical, long-term service for shooters who need dependable spare magazines for the range, duty, or training. Manufactured in the USA and supported by ProMag’s stated lifetime guarantee against manufacturer’s defects, this magazine is a straightforward, functional option for Sig P320 owners seeking additional capacity and durability.