+1 on this one.
ACOG can be changed to 1P29 (1П29 УСП "Тюльпан", listed above), or russian-made PSO-1 (ПСО-1, standard issue optics, used on SVD rifles, can also fit on AKs).
Also it makes sense to include them both with their pros and cons:
+lighter weight (~0.6 kg)
+cheaper (because widely produced in USSR, also there are many in stock)
-smaller FOV (6*)
-heavier weight (~0.8 kg)
-expensive (according to my research in the web, 1P29's cost as twice more, than PSO-1's)
+bigger FOV (8*)
-Greetings from Russia