CNC machined aluminum construction for lightweight and enhanced durability feature Reinforced structure along the shell's key stress points when in contact high performance parts Version 3 gearbox shell compatible with AK series AEG airsoft receivers Striking anodized red finish for aesthetic appeal In the Box 6X Screws 4X Split Lock Washers 2X Tooth Lock Washer Specifications: Brand Lancer TacticalMaterial AluminumGearbox Version 3Color RedPackage Includes 6X Screws, 4X Split Lock Washers, 2X Tooth Lock Washer California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov