The Grenade Recognition Manual
Grenade Data Sheet

Designation-  XL21E1 Country of Origin-  Britain
Type- Smoke, Screening Years or Era-  About 1975
Weight  
Diameter  
Length- Total  
Length- Body  
Fuze Designation  
Fuze Type  
Fuze Delay  
Filling Type  Red Phosphorous
Filling Weight  
Detonator  
Body Material  Rubber
Effective Radius   

Manufacturer-   Markings-  
Notes-  Experimental grenade designed to replace the No. 80.  Rubber bodied, filled with red phosphorous.  Appears to be designed for launching from a rifle with the attachment of an adapter.