Brainstormepilog

I'm trying to create a barrel with integrated suppressor for a weapon, the problem is that I don't know how to prevent muzzle attachments from said weapon being available to the suppressor barrel.

I've been trying to add a flashlight to a helmet for hours, my search for a tutorial was in vain, I didn't find anything and developing it back from the mining helmet didn't help either, does anyone know a tutorial in which the whole thing is explained?