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Discussion Starter #1
Ok this may sound very dumb, but bear with me for a second.

The manual for the Ruger PCC states to adjust the tension knob states to tension the adjustment knob, attach the forend assembly to the receiver, then hand tighten as much as possible. HOWEVER, with only that, there still is a slight play between the barrel and the receiver. I read that some people tension the knob until the foreend is too tight to be fitted onto the receiver, then dial it back for a very snug, no play fit. I have been doing this, and have had great results in terms of stability. However, when doing double taps, or any shot fast than 2x/second, I notice the adjustment knob will loosen back one notch. I was wondering if anyone has ever tried gluing the tension adjuster or using a bedding material to secure it to the spacer once the desired snug is met? A visual explanation of what I want to do below link. Since the knob is being glued to the spacer which does not rotate on the barrel, there should be no problem with the function of the gun.

Thoughts? Horrible, ok bad? I dont think it will have any negative effects, but I dont know anything regarding vibration between the two materials, barrel resonance etc.

http s://imgur.com/a0Hc084
 

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Let me tell you a tale...

When I first bought my PCC, I tightened the barrel nut as tight as I could but still noticed that it wasn`t completely snug against the receiver, no matter how hard I tried. And it too, would loosen at least a half turn or so. Figured that this was perhaps how it should be so went to the range...and had plenty of malfunctions.

Frustrated, I took it home and looked carefully and still couldn`t see what the problem was. Kept messing with it and suddenly, it turned farther than it had before and then completely snugged up to the receiver. Seems that there was a piece of trash, probably a shaving left over from the factory caught in the threads which wouldn`t let it tighten up completely. Most malfunctions then ceased although I still occasionally get one.

Take the barrel off the rifle and just keep twisting the barrel nut back and forth. Use some gun oil perhaps. Run the nut all the way towards the muzzle then all the way back down as far as you can. It could be the same problem I had and simply work itself out like mine did. I never did see the "sliver" but there was definitely something in there.

Could it possibly be mechanism (?) that holds the nut into place? When I now adjust the barrel nut, I can feel a slight "click" or indention when tightening the nut against the receiver. I believe this is a design function that essentially locks the nut into place.

Even if this doesn`t fix the problem, I`d still use Loctite before I glued/epoxied it into place since it`d be very difficult to get the glue/epoxy out if it turns out to be something else.

Do a search for my posts and you can read it all for yourself.

Good luck...
 

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Discussion Starter #3
Hey thanks for replying and an update!

So for me, the knob never had any trouble turning; I could turn the knob tight enough to prevent barrel insertion.
I ended up fully disassembling the entire barrel assembly, including removing the spacer and adjustment knob from the barrel itself. No debris to note. I ended up using blue 242 to the threads of the knob. Let it cure, and I took it to the range to see how it held up.
First day I shot about 170 rounds, mostly slow fire 1 shot/sec deal. Absolutely no prob.
2nd day I shot about 120 rounds. First mag was double taps, next 3 mags were basically mag dumps shot in 5 round bursts. Barrel got very hot. However, the knob was still secure in place, no damage present whatsoever. Im pretty sure what I did was not ruger recommended, but it fixed the problem I had. So I'd give it a cautious success for now. So far the PCC had 2k rounds, and had a total of 3 trigger reset failures, and no failures. Pretty happy with the performance.
 
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