Hi Larry,
Again, my Francotte catalog says "aileron" while my French literature (manufacture de St-Etienne, Verney-Carron, Flobert, etc...) consistently shows "oreilles" for sideclips.
More Belgian/French discrepancies...
After all, even the numbers 70 and 90 are called differently in both countries.

A few other barrel related words:
bande=top rib
tire-cartouche=extractor
verrou=grip (as in Purdey grip)
guidon=front sight
devant=fore-end
longuesse=ditto

WC-