Check this custom TWS Skeletonized Blue From The AirsoftJunkiez Custom Expert Series that uses the King Arms TWS M4 Skeletonized M-Lok as the base gun. It can be equipped with the HPA engine of your choiuce andit uses the Maxx ME Pro Hop-Up, UTG Blue AFG M-lOk, Maple Leaf 290mm Barrel, and more... "Airsoftjunkiez Expert TWS Blue custom build with premium Inferno and Black leaf trigger board, also comes with all accessories shown."