The M-16 don't have the holes in the side. Apparently they are made of empty drink containers that are the same size as chemical grenades. There also appears to be some fake M14, M6A1, and M18 grenades floating around. These are real smoke grenade bodies that some company bought off an overrun and painted up to look like other chemical grenades. One way to tell is the number and placement of emission holes.
Body is painted grey with very dark violet markings.
The M18 grenades have the same markings on the fuze, these will be harder to tell due to the body being correct for a smoke grenade but if the fuze is marked as above, be suspicious. This is an example of the repro grenades. There is one small emission hole in the bottom. Some new informatin has come to light about these particular repro grenades. Bert Mullins sends us this.