Action Bushings
Whilst using the Sinclair Action Cleaning Kit with a cotton swab attached in the Action of my Steyr Pro Hunter Rifle, I discovered that when I am turning the cleaning swab in and around the Action the swab ‘due to its size and tight fit’ will snag onto the Action Bushing and actually turn the Bushings in the Rifles Action out of alignment.
Once out of alignment the Bolt will not fully slide into the Action as the Bolt Locking Lugs are hitting against the Bushings that have now become misaligned.