Cloak Industries Assisted Reset Trigger Spring Gold. Rest easy with the Cloak Industries MFR Assisted Reset Trigger carbine buffer spring designed for use with the MFR56 belt fed upper receiver and Assisted Reset Trigger equipped AR-15s. Specifications for Cloak Industries Assisted Reset Trigger Spring: Manufacturer: Cloak Industries Color: Gold Finish: Heat Treat Fabric/Material: Stainless Steel Gun Make: AR Platform Gun Model: AR-15 Weight: 0.125 lb Dimensions: 1x1x14 in Package Contents: Cloak Industries Assisted Reset Trigger Spring What firearm models does the manufacturer say Cloak Industries Assisted Reset Trigger Spring is compatible with? The manufacturer suggests that Cloak Industries Assisted Reset Trigger Spring is compatible with AR-15Cloak Industries CLK-FRT-SPRG: Assisted Reset Trigger Spring Gold