In the PM that I sent you, the third link is the thread protector.
As a personal opinion, that adapter is ugly as hell and may add too much weight to your gun to make it functional. The way most GBB's work, is that the outer barrel operates on a "rocker" motion... in real steel applications, this is to aid the re-chambering of the next round. In airsoft, it helps "a little bit", but really isn't necessary, since Marui is able to function fine without rocking. However, MOST gbb manufacturers include that function to replicate operation as close to real steel as possible.
As a result of the rocking outer barrel/chamber, if there is a weight at the front of the outer barrel, it'll push the chamber up against the top of your slide; adding resistance, and making blowback sluggish. If there's enough pressure, it'll create too much resistance for your gun to even cycle properly, if at all. In worst case scenarios, the slide won't even blow back anymore. In those cases, re-chambering can only be done by pointing your gun directly at the ground (or even turning it upside down) to reverse the pressure before you can manually rack the slide.
I'm not sure how well the 2005v KSC mk23 can handle the extra weight on the suppressor, but I once had a KJW mk23 tactical in my possession that couldn't handle much weight at all on the thread before it got stuck. It would fire, the slide would fire back, but it would get stuck back until I pushed the front of the outer barrel up with my hand.
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