I recently purchased a used 15-22. I had bought a new sport model that didn't function well and needed to be sent in so i needed a spare. Anyway the used older model (quad rail without threaded barrel) has no sights, i do have a red dot but no backups. I was wondering where i can get some stock sights and what I should expect to pay. It just sort of bothers me not having the parts there. I thought about buying magpul flip ups but i just dont want to spend the money. Can you guys point me in the right direction.