This dosn't happen enough these days! I rember my first time, with my big one. She did it all 22 1911 ar ak 12ga. Took it like a champion.. still can't park in the lines? Lol
Pic's would help. I can't say a mid 70s dpms is compatible with newer areo parts? Is there a chance that the barrel nut was cross threaded before?
*Just for shits make sure you use factory torqued specks. *
Nice find @Sisco I guess today is the day.. I went to the lgs and put hands on a Henry x in 45.70 today. I'm guessing if it's available next week it will be spoken for!
That seems excessive for a " new rifle" ?. I would pull the handle and bolt out , clean and lube generously for starters. Try less rounds in the magazine or another if available.