The AMT Lightning pistol was made from 1984-87, in Standard and Bullseye models...
10-shot mags, and barrel sizes available were 5", 6.5", 8.5", & 10".
Millet Adjustable Sights...Checkered Pachmeyr Rubber grips and stainless finish.
There was also a 16 & 1/2" barrel with shoulder stock conversion kit...some folks just liked the really long barrel...
Comparison pic...
Bullseye edition...note the Charles Bronson Wildey rail look...lol
Sad thing, they were more precise than the Ruger models they copied...probably why Ruger sue'd 'em...lol
Hope that helps a little...