I have purchased a lovely wooden stocked Beretta A300 Outlander. I want to extend the stock by 1/2 inch or 12.5mm. Beretta sell nice neat Stock Extenders - one for Field guns and one for Sporting guns. They are neat, easy to fit, inexpensive spacers. The problem is that I can’t find anywhere on the net which is appropriate for my A300 Outlander. Understand that the profile and length of each is different but Beretta don’t publish the dimensions! Any ideas to save me buying one of each?