I had WE AK74u done with Diy short stroke buffer and works great. But this is not what I'm looking for, thanks!
Silence, something means "thinking". I have thousand thinking in my mind, I don't even know what I was looking for, so I tried to keep asking and talking see if could get what I wanted! Seems silly hah!

A bit more complicated question. I can't stop the bolt movement when firing, but I want to fire it without bold blow back:
Is there a chance I could modify a M4 internal with a switch to semi and manual?

No.

What you're asking is to essentially reverse engineer WE Tech's GBB gas system and redesign it to your needs.

THe solution to this question is simple: AEG....

Thanks eluder, I know it's a pretty hard question, that's why I said it's complicated, and asked to see if I could have some one helping me to find out solutions, or someone did try it before. I'm a gbb only guy and no more aeg!
This thread is for researching my next project use. I'm not just asking for fun.
Anyone has any more ideas or solutions for me, please!

How can I modify a M4 trigger set assembly, add a switch or selector to make it a semi auto and manuel only mechanism? Thank you! This is now I'm looking for!