Aero Precision AR-15 ATLAS Barrel Nut Wrench Black. This wrench comes with ATLAS S-ONE & R-ONE handguards. This is for customers who lose or damage their ATLAS barrel nut wrenches. This wrench is ONLY compatible with AR15 ATLAS Handguards. Specifications for Aero Precision AR-15 ATLAS Barrel Wrench: Manufacturer: Aero Precision Color: Black Gun Model: AR-15 Condition: New Quantity: 1 Finish: Anodized Country of Origin: USA Package Contents: Aero Precision AR-15 ATLAS Barrel Wrench What firearm models does the manufacturer say Aero Precision AR-15 ATLAS Barrel Wrench is compatible with? The manufacturer suggests that Aero Precision AR-15 ATLAS Barrel Wrench is compatible with AR-15Aero Precision APRH100515: AR-15 ATLAS Barrel Nut Wrench Black