Increases Reliability in ALL 1911 Pistols Aircraft Grade Certified Stainless Steel Tube Resists Corrosion .025" Tube Walls Tubes are Heat Treated for Maximum Durability and Service Life Patented Extended Skirt, ANti-Tilt all Metal Follower Ensures Lock Back and Increases Feed Reliability in all .40 S&W 1911 Pistols Maximum Tensile Strength Heavy-Duty Spring for Long Service Life, Enhanced Feeding and Positive Slide Stop Operation Removable .350" Plastic Base Pad for Easy Maintenance and Versatility with Different Base Pad Options Proven Inherent Reliability, Durability and the Ability to Remain Loaded for Long Periods of Time Without Damage No-Risk Service Policy - If It Breaks from Normal Use, Wilson Combat will Replace It Metal Spacer Ensures proper Feeding with factory .40 S&W Ammo