I have a Box-lock Grade A Lefever SxS in 12 gau. It has a single trigger - how common is this? Also it has a beaver tail fore-end that is OK but just doesn't seem right, looks to be a replacement. Did Lefever produce beaver tail fore-ends at the factory? If they did could someone post a pic of one - it would be appreciated. I know absolutely nothing about these guns so any comments / insight will be appreciated. --- John