This is totally unrelated to the bolt but in case you aren't aware:
Remington 721s have a safety issue which can be pretty deadly. Occasionally when you flip the safety off, it will fire, assuming of course that you have a round in the chamber. My father was nearly killed by his father this way when they were out hunting; granddad had a round chambered and the safety on, sling carry, while going through some dense bush. Dad was behind him when a branch popped the safety off, setting off the rifle. Missed him by a couple of feet and granddad had to spend a good long time sitting down collecting his nerves.
So anyway, seems like a nice rifle but get that safety sorted out if you haven't done so already!