during the weekends game, i had some problems with misfeeds. so today i opened the gearbox and noted quite some interesting finds:
Please bear with me coz this is my first ak... hehehhehe
1. spring is silver in color
2. over greased gears
3. piston body has already some nips in the teeth
4. gearbox is not well shimmed and aligned. you can hear rattling sounds of the gears as i tried to shake the GB from side to side.
so after tuning it up: properly shimmed and greased i tested it again to see if it still misfeeds. unfortunately it still does. so i checked the hop chamber, no problems there. then i checked the magazine. i found out that the mag release has to be pulled back in order for the mag to properly fit and prevent it from moving. Maybe i got lemons but it didn't quite solve the problem.
Then i went back to the alignment of the hop unit and the gearbox found out that there is a small misalignment of the body that when the handguard is moved, misfeeds do occur. so i had to tightly screw the front assembly in place and see to it that there is no extra movement that may lead to misalignment of the GB and the front assembly.. after doing such, there is still times when misfeeds occur. About 90% of the problem has been corrected. but im still not satisfied. so probably tomorrow ill try another mag and test it my stock magazine has a bit of problem... hehehhe