This may be a dumb question. I have a new TRR8 that after 200 rds or so, the barrel nut came loose. I obtained the Dan Wesson barrel nut tool which fits the S&W nut exactly. It is difficult to adjust the nut after setting up the B-C gap because the muzzle end of the barrel is reverse threaded while the breech end is normally threaded. So when you tighten the nut by turning ccw the barrel turns and loosens creating more gap. By restraining the barrel with several wooden chopsticks I was able to find a point where a slight turn cw of the barrel nut created a seizure point with proper torque.

This seems wrong to me. The muzzle end should be normally threaded so that when you tighten the barrel nut the barrel nut is pulled towards the frame creating the seizure point. I hesitate to send it back because S&W didn't get it right the first time. Is the barrel incorrectly threaded on the muzzle end? Am I screwed up? Before I take S&W to task I would like to be on solid ground. (BTW: wonderful, accurate gun!)

I didn't know the barrel to frame threads were Left handed if that's what your telling us..
Very Cool that the DW 357 Barrel tool works on them BTW..
I've have a DW 15-2 357 & the threads in the frame are Right handed same as the barrel nut.
On the DW I put a brass feller gauge inbetween the cylinder & barrel at the gap point of what I want the gap to be, The factory recomends .006" but I set mine between .0025"-.003" as I shoot jacketed only bullets..
When I tighten it the gap does change slightly.
Not sure how you used the chopsticks to hold the barrel but could imagine a padded set of robogrips holding the barrel at the forcing cone while tightening the nut..Or use some type of plastic/wood wedge? Chopsticks maybe?
Sounds Like you got it now though..
Interesting?? LH Barrel to Frame Threads??
What were they thinking?? Hmmmmmmm..

No, the barrel to frame threads are right handed, the nut to barrel (MUZZLE END) are left handed. The nut not only secures the barrel but also secures the shroud. I shoved three balsa wood chopsticks right into the barrel (breech end) and held on to them to keep the barrel from rotating while tightening the nut with the DW tool.

I wonder why they used left hand threads on the barrel Nut??
The Nut also secures the shroud on the DWs Too.
I now understand how you were able to hold the barrel..

Also Welcome to the Forum K4AA

Thanks HEADKNOCKER for the welcome. I called S&W Tech Support today re: the barrel nut issue. The barrel nut is designed to be LH thread. They have a special tool to hold the barrel. They will tighten mine if mine does it again. They are great people. However it still doesn't make any sense to me why they would have LH thread on the muzzle end and RH thread on the frame end.

So you can't put the barrel in backwards by mistake?

On the Dan Wesson design the barrel is threaded the same threads on both ends but the frame end is threaded about an 1 1/2" were the barrel nut end is threaded about 3/4", making it all but impossible to put the barrel in backwards..
Also there's a forcing cone on the frame end..
The Tentioned barrel design I believe is what makes those DWs shoot so darn good, absorbs vibration..

The S&W 327 barrel is pretty obvious. The forcing cone sticks right out. It's not an issue of putting it in incorrectly. To me RH threads on both ends makes sense. One LH and one RH doesn't make sense.

S&W does it that way--seemingly "Ass Backwards"--so that it is NOT "User Interchangeable", like the DW guns. Nice to know that they TRUST the end users--US--so much! Paulie686.

The barrel is manufactured by Walther for S&W. Just another example of problems associated with outsourcing!