The fire rate of the AM-23 is inaccurate. It is 600 RPM in game currently instead of 1250-1350 RPM. As seen in this Screenshot.
This is inaccurate, these sources prove that it is inaccurate.
Óãîëîê íåáà ¦ ÀÌ-23 23-ìì àâòîìàòè÷åñêàÿ ïóøêà (AM-23)
AM-23 - NamuWiki (AM-23)
Afanasev Makarov AM-23 - Wikipedia (AM-23 Optional Source.)