Strange belgian M63 rifle grenade

[MINENAZ16]

Very strange tail.
Is it an experimental version or a fake ?

 

[Antoon]

Never seen before.

Normally by adding only a steel tube the hand grenade was transformed to a rifle grenade.

Found also this picture with fins on the internet. Maybe also fake.

 

[Francesco_Dif]

Not fake, late exemplares has fin stabilized tail.

 

[US-Subs]

I was never certain about this one either. Picked it up in Belgium around 2008.