SIG SAUER P320 Airgun Magazine 2-Pack. 177 Caliber Magazine for the SIG SAUER P320 air pistol. This magazine is constructed of durable polymer and features a patented 20 round rotary belt. Specifications for SIG SAUER 2-Pack Airgun Magazine: Manufacturer: SIG SAUER Color: Black Fabric/Material: Polymer Magazine Capacity: 20 Round Projectile Caliber: .177 Caliber Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Package Contents: SIG SAUER 2-Pack Airgun Magazine SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER 2-Pack Airgun Magazine is compatible with? The manufacturer suggests that SIG SAUER 2-Pack Airgun Magazine is compatible with SIG Sauer P320SIG SAUER AMPC-177-20: P320 Airgun Magazine 2-Pack