I may be wrong but I don't think any Accutriggers came on flat rear receivers. I have both flat-rear 110 actions and round-rear 110 actions and the base holes are drilled the same. Some vendors use "flat rear" and "round rear" to designate different bases. I don't think the Accutrigger is easily adaptable to a flat rear receiver. It can be done but I would go with a Rifle Basix or Sharpshooter trigger.
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