G&G front sight and gas tube removal
 

Hello All,
Before start to take things apart, I was hoping someone would know the answers to my questions.

I have the TOP TECH G&G m16. I'm looking to remove the front sight and the mock gas tube.

I've done this before on G&P and a King arms m4, so I know how it's done. However, I remember reading somewhere that these particular G&G models cannot have the front iron sight removed.

Also,
I am wondering if i need to separate the upper and lower receivers to remove the gas tube.

Thanks in advance!

Outer barrel and front sight removal starts at around 3:40

https://www.youtube.com/watch?v=8XmPoBBg4qM

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