word from TOS is that Wilson Combat has a good "S7 tool steel" AR-10 bolt catch.
https://wilsoncombat.com/bolt-release-ar-10-multi-cal-bullet-proof-checkered-black.html
https://wilsoncombat.com/bolt-release-ar-10-multi-cal-bullet-proof-black.html
https://wilsoncombat.com/bolt-release-ar-10-multi-cal-bullet-proof-checkered-black.html
https://wilsoncombat.com/bolt-release-ar-10-multi-cal-bullet-proof-black.html