The partial depth hole forward (to the right) of the recoil lug?
Looks like a Remington 700 to me... Did the bolt handle fall off and trigger snap too. The extractor hanging on by a fingernail?. Wait, it is a fingernail.. Carry on..
Based on what, the barrel nut?
There is no way to coexist no matter how many bumper stickers there are on Subaru bumpers!