The metal slide I am using is the cheapo white trade one. What metal slide do you have? And do you see where I file? The corner of the front chamber only, on both sides. I get this idea from comparing my metal outer that came with my metal slide, that barrel had the angle so I did it and wham it worked.
If you don't have an o-ring I strongly recommend you get one, the inner barrel is supposed to have an o-ring wrapped like mine for stablizing shots and also puts the back hook of the inner assembly at a good angle to engage the frame. Which could also be your lock up problem. I know exactly how you feel, took me 2 weeks to figure it out.
Now try this, when you gun locks up with silencer attached, turn the gun up side down, and cock it. It works right? Now if this works it either means the hooks on the outer isn't engaging the frame right, or the front chamber's sharp corner (GNG's sharp) is catching the chamber space on the slide. That's why the file.
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