sorry guys, i know its not a Rossi rifle, but i didnt know where else to ask. The foregrip on my old double barrel won't stay on the gun when i shoot it. every time a trigger is pulled, the darn thing popps off. i've tried cleaning it and oiling it really well, tightening screws, everything, but it just doesn't help. it is an old model with the external hammers. i'll get back to you on the exact model number. any help would be greatly apreciated.