Box Modelling Technique Problem Needed!
I'm trying to box Model a weapon like the guys in the Gif, but I can't seem to recreate his technique. He Extends some faces to create an extension of the Poly. Basically Extruding it out
I've tried recreating him step by step but I keep running into problems.
Anyone know the technique and how to do it?
Gif of Technique he does:

when I try to re-create it:

I get some weird black face on one of the Poly faces

Help is much appreciated
Last edited by JamieGB; 11-08-2015 at 02:48 AM.
Reason: Adding information