The inside of the Ruger clip may just be dirty.I had something similar happen with one of my mags, solved the problem with a good dose of wd-40 and let it drain upside down. If that doesn't work, just buy a new one, they are cheap enough.
As for the jamington...I mean remington, try wrapping the treads with teflon tape. 3 - 5 wraps should keep it in place until you unscrew it again.