Here is the optic I have on my AR57. I think I paid about $100 at a gun show.
https://www.amazon.com/dp/B00OV1B9GS/ref=cm_sw_r_other_apa_i_z1kTEb9ESBM5T
This is about the only ammo I have found for it. I looked it up when I saw the rifle on Tromix.
https://www.targetsportsusa.com/375-socom-ammo-c-2662.aspx
Susan worked with a lady that had her tubes tied when she had her 3rd son. Her husband had himself snipped as well. A couple of years later, she ended up pregnant by her husband with their 4th son. Both surgeries had reversed themselves.