If you mean the 40x107R, then this thread is devoted to it (with a lot of information in posts 11 and 16): http://www.bocn.co.uk/vbforum/threads/27172-Naval-2-pounder-question?highlight=high+angleThanks for the ID. This is a new one for me. Any information on the gun and it's maker? Who made the case and date? Thanks agian, highlandotter