The Madbull PWS MK112 Rail unit is a extremely high quality and innovative rail system. The MK112 rail is a proprietary non free float design that allows the user to remove and replace the individual rail panels if needed without removing the entire rail system. This rail features a built in gas block at the front of the rail that will keep your outer barrel extremely sturdy as well as provide a realistic look to you AEG. Of course since this rail is made by Madbull with full licensing from PWS, full trade marks are featured on the rail as well as a extremely realistic finish. Madbull takes great care in creation of their rail systems and they use only the highest quality T6 aluminum which makes this rail extremely strong and durable while still being light enough not to weigh your AEG down.