Hey guys,
I have the Echo1 ak47 RIS, i know it's not a WOW gun but it's ok for starters

I'm looking foward upgrading it.
I bought a tightbore precision inner barrel , hop-up chamber , hop-up bucking and sleeve and air seal nozzle for ak47.
I'm wondering , how do you remove the ironsight so i can remove the inner barrel and get access to the hop-up chamber and hop-up bucking? A guide for opening the gearbox (to change the nozzle) will be very helpful. I googled all around and i searched on ASC , coulnt find a thing =/ .... Thank you.