Pro Mag Enfield No. 4 MKI .303 Rifle Magazine Steel Blue 10 Round ENF 04-10RD. 303British. Magazine body and follower constructed of heat treated blued-steel with a Chrome-silicon wire spring to ensure reliable feeding and function. made in specialized factories Specifications for Pro Mag Enfield No. 4 MKI .303 Rifle Magazine: Manufacturer: ProMag Color: Blue Fabric/Material: Steel Magazine Capacity: 10 Round Caliber: .303 British Gun Make: Lee-Enfield Gun Model: Lee-Enfield No 4 Mk 1 Quantity: 1 Condition: New Features of Enfield No. 4 MKI .303 Rifle Magazine: 10-round magazine Fits Enfield #4-MK I (SMLE) .303 British cal Magazine body constructed of heat treated steel with black oxide finish Stamped steel magazine follower Magazine spring formed from heat treated chrome silicone wire Package Contents: Pro Mag Enfield No. 4 MKI .303 Rifle Magazine What firearm models does the manufacturer say Pro Mag Enfield No. 4 MKI .303 Rifle Magazine is compatible with? The manufacturer says that Pro Mag Enfield No. 4 MKI .303 Rifle Magazine is compatible with Lee-Enfield No 4 Mk 1Pro Mag ENF 04-10RD: Enfield No. 4 MKI .303 Rifle Magazine Steel Blue 10 Round