I found that this mod causes missions to become uncompletable. I forgot the name of the mission, but it involved luring someone out of a slag plant and killing them. After killing them, an AKM with a mod sight would drop, and the mission assigner would keep moving and become unable to trigger dialogue.

I dont remember this mission. I would have to find out where it is.

- Is it a main quest or side?
- Where do you accept it?
- What scope is installed on the ak74?

I found it. It's a side mission called “Deceiving the Deceiver.” U need to lure Zakhar away from the Slag Heap. I remember that AK installed a 1P87 scope with a Picatinny rail was installed above the dust cover.
After kill Zakhar , u need to receive reward from a man called Akopyan and he is suppose to stay inside the Slag Heap( this is happened after i uninstalled this mod), But I found him on the side of the road near the Slag Heap, and he was constantly moving and unable to trigger the quest dialogue.
hope u can solve this problem, i relly love ur mod.

the GP37/G36's rail attachment disappears when I unmount any of the optics once. i need to go back to a technician to buy the rail again. otherwise everything else seem to work fine. oh, not a bug but the animation for mounting the OKP-7 on an AK74 has the optic not in the right position in the hand but corrects itself once it's on the weapon.