My Contender sling swivel studs came from SSK industries many years ago. They replace the Pachy forend screw and the grip screw. Maybe they have a similar setup for the Encore. I suggest you email or call them.

"Therefore go and make disciples of all nations,... "
Matthew 28:19

Handgun hunter since 1979 - haven't used a rifle since!
HHI member #992, NRA, SCI.