Nuprol Grenade.

[snuff]

Sorry talking rubbish..

 

[Daveoc33]

@snuff there are a few boneyard grenades bits here that my help you. A bit pricey but it's a option at least. 

https://staffordshiremilitaria.co.uk/product-category/airsoft-guns/boneyard/

 

[snuff]

Great find, thank you.