I ordered the M5 Oberndorf bottom metal as JCM suggested above. It is an
Ounce heavier than their standard Obendorf. Seems substantial. It is cut for the Wyatts extended box, which I also ordered along with a Wyatts spring and follower, and a TriggerTech…all in stock from RHR. Brownells had the Hawkins LR Hybrid rings for Defiance actions in stock.

No barrel to screw in to toy with actual feeding. I’ve ran several loaded and empty cartridges (6.5x55, 243 & 6.5 Creedmoor) through it. It picked them all cleanly from the mag and spit them out the front of the action.

Liking these rings. Definitely more substantial than Talleys. Fit to the AnTi receiver body appears better than any other combo I recall.

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Don't speculate when you don't know, and don't second guess when you do.