The ERGO Never Quit Magwell Grip reconfigures the squared shape of the AR-15/M4 magazine well.Reconfigures the squared shape of the AR-15/M4 magazine well into an ergonomic and comfortable grip optionFeatures: Gives AR-15/M4 receivers a distinctive aesthetic upgrade Easy installation Oil and solvent resistant Must have mil-spec trigger guard for installation Allows arms to stay close to the body for a very sturdy hold Cannot be mounted to lowers with permanent trigger guard Woodland CAMO color does not include green Available Colors: Black, Dark Earth, Grey, OD Green, Royal Blue, Coyote Brown, Graphite Grey, Pink, Purple, Red, Robin's Egg Blue