Mag=Magnesium frame.
ACP Authentic Cop Protector.
And, no, I haven't made the rookie mistakes made by LGS counter monkeys.
I take the time to learn about these things before speaking of them.
If I don't know, I will admit I don't know. Then, I'll work on learning all I can about them.
It reminds me of people who grossly misspell a company's name when it's clearly stamped, engraved, or printed on the item, right in front of their eyes (Pachmayer, Styer, Steyer, Hornaday, Horndaddy, etc. grrrrrrrrr)
The internet was a much better place when the functionally illiterate were not on it.