Thoughts on 642?

I got a 637 5 weeks ago and have put more rounds through it in that time than any of my other guns. I shoot it DAO and it's a great gun to use to improve trigger control and accuracy. The only problem I have now is that when I first pick up my 4" model 66 it feels like I'm lifting an anvil.
 
I had a 442 that I really liked, so I decided to get a 642. I bought this gun new, and it has never been fired. Dry fired maybe 800 times or more with snap caps. recently I was fry firing it and the upper left hand screw in the side plate flew out. I managed to find it and screw it back in. But, the screw starts to back out after only about 20 dry fires or so. I can actually see it turning. Should this be sent back to S & W?

Just use some thread lock. Some guys use nail polish. I've used the lock tite that is not permanent. Can't remember if it's the red or blue. My 357 guns needed it the most.
 
Just use some thread lock. Some guys use nail polish. I've used the lock tite that is not permanent. Can't remember if it's the red or blue. My 357 guns needed it the most.

Do NOT use the red loctite. That's the one that's nearly permanent (it requires heating to break the seal).
 
I had a 442 that I really liked, so I decided to get a 642. I bought this gun new, and it has never been fired. Dry fired maybe 800 times or more with snap caps. recently I was fry firing it and the upper left hand screw in the side plate flew out. I managed to find it and screw it back in. But, the screw starts to back out after only about 20 dry fires or so. I can actually see it turning. Should this be sent back to S & W?

I'm on the fence about this one. I've had screws loosen from shooting but I can't remember having screws loosen from dry firing. It might be worth an e-mail to S&W. If nothing else is wrong with the gun, then a small amount of blue or purple loctite could work. I've used blue loctite to keep screws from loosening. I used a very small amount, applied with a toothpick to the screw threads. It doesn't take much loctite to secure the screw. Don't use red loctite.
 

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