Hi All ! Thanks for reply , the questioned I ask is a bit stupid , and I found that the king arms metal receiver is fully function on all the knob and the dust cover also can be close when you didn't play it

Also the internal can move too when you pull the T bar ha .. the T bar I said ,what a noob I am , I am not even know the name for those fit on that gun :banghead::banghead:
Please forgive me my lord he .... :infantry::infantry:
I like things to look like real , due to this is my first build , gun is not in perfect , so I try to make it looks better and feel better when I play and when I store it , so actually I am very angry with myself for not going do any deep research ha .
So lets see what is on my gun on that picture k , give me idea what is missing .
Thanks .