I have a lot of experience with these being the Canadian dealer for many years. If you use a Barnard bedding block you will use a cap screw which fits into the bedding block as a recoil lug (clean it well and use loctite). If you want to use conventional bedding then use a recoil lug screwed into the recoil lug slot (with loctite). I made them with a three degree draft on three sides to make it easy to pull out of the bedding when needed. The absolute last way I would do it is with a washer type recoil lug, a la rem. Barnards are very hard so I would not attempt to pin them to the action. Any questions then ask.
By the way, Barnards are about the best action made!!!