With regards to the OP's original question. If you have some calipers, measure from the front of the two bolt bodies to the cocking piece pin shelf at the rearmost of the window. If that shelf is closer to the bolt head end than the factory bolt body, that may be your issue. I guess the spacing for the crossbolt hole to the end or the shelf could be a potential non conformance making the sear not catch on the trigger. Another way you could tell is with it assembled and in the action see if the sear is in front of the trigger(sear) or behind it. When customizing a SAV2 to work on a bottom release I found this issue.