I find it hard to equate the forged Howa action with a one-piece forged bolt with those others you mentioned, especially when some of your "good" ones have bolts that are brazed composites notorious for falling apart now and again.(this is a good chance for someone to post their pictures of Remington bolts with no handle
)
Used rifles can be great buys, but only if tha buyer has the know-how to sort the wheat from the chaff. Sometimes there's a good reason why they're on the used rack and the last thing our boy needs is a problem or a project.
