Nighthawk Custom Mag Catch Lock and Spring Drop-In Blued Carbon Hex Head Fully Machined Steel. Each part is Fully Machined from a premium-grade 416 stainless steel billet creating the highest quality parts on the market. Our mag release is designed to be 1/16 longer than a Colt-spec part providing for an easier reach and more leverage when making mag changes. The mag release features 30 LPI checkering on the face for positive engagement. Whether used for competition shooting or everyday carry save split seconds on your mag changes with an upgraded mag catch. Specifications for Nighthawk Custom Drop-In Extended Magazine Release Kit: Manufacturer: Nighthawk Custom Gun Make: 1911 Platform Gun Model: 1911 Weight: 0.5 lb Condition: New Package Contents: Nighthawk Custom Drop-In Extended Magazine Release Kit What firearm models does the manufacturer say Nighthawk Custom Drop-In Extended Magazine Release Kit is compatible with? The manufacturer says that Nighthawk Custom Drop-In Extended Magazine Release Kit is compatible with 1911Nighthawk Custom SDP1020: Mag Catch Lock and Spring Drop-In Blued Carbon Hex Head Fully Machined Steel