Mad Bull Gemtech Halo Barrel Extension
The real HALO Silencer is produced by Gemtech.
The toy silencer can be applied to most of NATO rifles, machine guns and rifles with M4 style flashhiders.
Including to most of M4, M16, AUG, M249, SG551/552 and more...If you AEG fhashhider's outer diameter (ID) is similar to M4, it shout work. (not guaranteed. Because different factory have different standards.)