Ww2 u.s. M13 50 cal. Rifle grenade. I need help with i.d. Of other

[vinnyw]

Has anybody ever seen the one on the left before,seems like a M11A3 ptatice rifle grenade but it has fins.The fins look like M29 rifle grenade fins but it was a little early for them.Any information would be very helpful.
vinny

 

[siegfreid]

It looks like a set of M29 "Energa" fins have been fitted as the original drum tail was missing . You can see a difference in the wear on the paint . Hope this helps.

 

[Jawasinger]

I agree M29 fins on a M11 tail boom