Seeing the round gripped LanCay M9-XM on ebay last week made me realize that I don't think the other variation has ever been featured here. When LanCay made the solid tang bayonets they produced the standard round grip (as seen in the auction) and a corresponding number of bayonets with green M7 style grips. Here are front and back views of the bayonets
Here are pictures of the blade markings on the two different variations; USMC and US Army