bud..you need to stop reading all the poop thats out there on websites,,you cant pull a insert out, as when you screw or push a barrel into place it butts up to a shoulder, also 687 is big, most bolts are way smaller than this, also peeps like me and monkey know what we are doing, so we check out the size of the bolt,,its all on my tube channel bud.
If you you want the facts just ask,,if a bolt runs out big then we turn the bolt size down ??