JBU (MSS) modular supressor system Aluminum alloy material 14mm counterclockwise thread 5-pc set Unique JBU serial number 6.75"x1.5" This high-quality modular suppressor system by JBU will enhance the look of your airsoft gun. The modular suppressor system is made of aluminum alloy material for extra durability. The 5-piece set includes a barrel cap, forward extender, base extender, flash hider & adapter. Does not suppress the sound/noise of your gun. For airsoft use only.