Pits look nasty, but you could still probably shoot it as a 20 with GaugeMates or chamber sleeving if a gunsmith says it's not safe as is. I have a couple of Brescias and they are nice guns. Have never actually seen one in 16, so may be awhile before you see another one. Send it back? Screwed? Depends on what you paid and how you plan to use it. If seller is not answering calls or emails, send a registered letter informing him that you want to return it, but do that within the three day inspection period. Might have a gunsmith look at it while the letter is in transit.