Hello and Welcome to the BBS!
Photos can only be uploaded in the sales section - to show pictures you can either host it on a 3rd party site like imgur or photobucket, or if it is a picture already online then you can just post a link.
I had a quick look around for this part for you, but the two go-to sites for airgun parts don't seem to have it in stock. http://www.airgunspares.com/store/ has nothing at all for the G10, and https://www.gunspares.co.uk/ has some parts, but unfortunately not the bit you're after (their list of G!0 parts here: https://www.gunspares.co.uk/products/24504/G10/).
I suspect it may be easier, and not much more expensive, to buy a new pistol. Although perhaps a friendly member may have a part knocking around for you.