Dark Storm Industries Magazine Release and Spring Kit Black. This set includes all necessary components for reliable mag changes whether you're building from scratch or refreshing an existing lower: Magazine Release Catch Magazine Release Spring and Magazine Release Button. Specifications for Dark Storm Industries Magazine Release and Spring Kit: Manufacturer: Dark Storm Industries Gun Make: AR Platform Gun Model: AR-15 Color: Black Gun Type: Rifle Features of Dark Storm Industries Magazine Release and Spring Kit Mil-Spec Dimensions for Universal Fit Package Contents: Dark Storm Industries Magazine Release and Spring Kit What firearm models does the manufacturer say Dark Storm Industries Magazine Release and Spring Kit is compatible with? The manufacturer says that Dark Storm Industries Magazine Release and Spring Kit is compatible with AR-15Dark Storm Industries DSI-LWR-MAGREL: Magazine Release and Spring Kit Black