Just bought a remington 870 express (wood stock)with the rifled barrel and 20 standard barrel. It was alittle abused but cleaned up nicely. I was able to purchase plastic buttstock(remington) and plastic foregrip(unknown but shorter than stock). How do I remove the wood foregrip and replace it with the plastic one? Any insight you guys provide is greatly appriciated. Also the wood stock n grip I am going to make beautiful again.