The Madbull Noveske Low Profile Switch Gas Block is not made to fit inside rail interface systems. The front of the gas block is to remain accessible so the user can adjust the amount of pressure that's routed backwards to cycle the bolt. Obviously this feature is only made to imitate the real product and serves no function for airsoft but it is a unique feature that displays Madbull's attention to detail in making an accurate replica. Similar Gas blocks have become popular and can be seen on numerous precision and civilian style AR-15 rifles, its another great way to customize your AEG to make it your own. This gas block features a small but visible Noveske logo on the front, it adds a small bit of flare for those with very good attention to detail.