Leapers UTG QD AK Side Mounts with Leapers UTG M-LOK Angled Picatinny Mount 

It's like 1 mm off, doesn't move at all. Hold zero

if its a yugo ak, this mount will not fit properly, I suggest getting the Russian version of this mount.

www.leapers.com/index.php?act=prod_detail&midx=2456&allids=2448_2456&itemno=MT-UAK01

No

I am not quite sure, you could put a laser, maybe a small red dot if you a scope of the top, maybe an IR flash light. Only reason I got is because zastava had one of their side mount so I get it as well from utg.

It's definitely used for a back up red dot

Tampons holder

You Could Add A Leapers/UTG Angled 45 Degree, Filp Up Front Sight, If You've No FSB (Front Sight Block). Placing That On The Angled Picatinny, With It Secure With Blue Loctite, Should Snug It Up Real Nice.