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Found out the issue and got it fixed.
1 slide not returning to proper position:
Turns out the RA-Tech magazine lips were too high. It ended up holding the air nozzle and wasn't letting it return to proper position after blowback. After sanding down the air nozzle a bit it works perfectly.
2 miss-feeding:
Issue still happens when I don't pull the trigger hard enough or all the way back. Don't know why but as long as I pull the trigger completely it feeds every time.
3: missing pin:
Just cut an small nail now it fits.
4 loading the co2:
Instead of using the little key they provide I went and used a flat head screwdriver. Easier to hold = turning the screw faster = little gas escape.
5 Loading ramp not pushing:
After disassembling the entire gun and discover the previous owner must have installed a wrong kind of hop up rubber. It was way too big which turn wouldn't let the bb push through the loading ramp. Got a new KSC hop up rubber and it fit like a glove.
I am so relief that my gun works great! Accuracy also improved at 35' grouping was less than 6". Though if only I knew what the issue was I wouldn't have spend over $200 on replacement part/upgrade parts which turns out didn't need any of them. At least now I have a lot of spare parts!
Solved this all by myself!
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