SIG Sauer ProForce P320 M18 Gas Magazine (21 Rounds)

Compatibility & Capacity

• Designed specifically for SIG Sauer ProForce P320 M18 (and cross-compatible with the P320 M17 and X-Carry) gas blowback airsoft pistols

• Holds 21 + 1 BBs (21 rounds loaded, plus one in chamber) of 6 mm plastic BBs

Propellant & Construction

• Supports green gas (propane) and top gas; some retailers note CO₂ variants exist but green gas is standard

• Built from metal alloy with a polymer base plate, featuring authentic SIG Sauer trademarks for genuine OEM quality

Weight & Dimensions

• Weighs approximately 8.2 oz (~0.52 lb or 235 g) when empty

• Flush-fit design aligns with the pistol's frame, maintaining proper balance and handling

Key Highlights

• Licensed OEM part - carries official SIG branding and engraving.

• Reliable feeding, backed by high-tension spring and metal alloy body; polymer base protects against impacts

• Semi-auto gas blowback compatible - continues the authentic recoil and slide cycling of the M18 pistol