For some reason most optics in the game use an obviously incorrect German style T-Post reticle.
The Japanese optics should look like this instead:
Type 97 Sniper Rifle 2.5x
Type 99 Sniper Rifle 4x
Type 97 Tank Machine Gun 1.5x
Type 96 Light Machine Gun 2.5x
(I know Type 96 doesn’t have a reticle right now because the scope is unusable, but for future reference this should be useful)
Sources:
Type 97 rifle:
https://kashiyuko.wordpress.com/2011/12/07/タナカさま-九九式狙撃銃・九七式狙撃銃-のレティ/
https://seiga.nicovideo.jp/seiga/im1526778
Type 99 rifle:
https://www.gunboards.com/threads/type-99-arisaka-snipers.1183769/
https://seiga.nicovideo.jp/seiga/im1520264
Type 97 tmg:
https://aucview.aucfan.com/yahoo/j1054233548/
http://regimentals.jugem.jp/?eid=1903
Type 96 lmg:
https://nihonmasamasa.militaryblog.jp/e992220.html