RE: mossberg 500a
 

heres a picture of the swivel set you will need if your shotgun is not already drilled and tapped for sling swivels. the red arrow points to the new locking bolt which replace the old existed locking bolt that is currently on the barrel

RE: mossberg 500a
 

order one from mossberg

RE: mossberg 500a
 

just wondering if you found something that would work for your gun? hope my posts helped ya out.