The AEM2 attaches to the weapon via a mount(not included) and a locating collar that goes over the barrel for alignment. The suppressor mounts via threads on the outside of the mount centering on the adapter fitting. A 20 degree taper on the adapter locks the silencer onto the barrel. On the M4 this fitting stops forward of the M203 cutout allowing the mounting and use of the M203.
Finish: Black OxideLink to parts manufacturer