Hello. I recently got a Remington 510 X after my uncle passed. I've been looking to replace the missing rear sight, but haven't had much luck finding one. I saw one on Ebay for $300, but that just seems like too much to me when I've seen complete guns go for around that price. I'm wondering if anyone here can point me to a place I can find rear sights. If not, does anyone know what kind of scope mount this has? It currently has a broken Tasco scope sitting on it. It's not a rail I'm familiar with, so I don't know what kind of scope or mount to look for.