[GG&G products]

For charging handle, bolt release pad .Yes they are.

But not sure about receiver end plate.

[M2 Problems]

maybe there are different names for the lever. but i beleave in my M3 manual its the "cocked indicator tab"

 

Jesse

Cartridge drop lever (Works three ways:)

• Pulling back on the operating bolt handle and pressing the cartridge drop lever locks the bolt to the rear.
  
• With bolt forward, pressing it releases a shell onto the carrier.
  
• Visibility of the red dot indicates the hammer is cocked.

[M2 Problems]

You have to press the little tab by the trigger guard to get a round to the top of the carrier and THEN rack the slide. Sorry I don't know the name of the tab.

cartridge drop lever