I hate to revive such an old thread but I'm interested to know of any gunsmiths that can do this to a Sako AV 375 with two collars. I spoke to a local gunsmith last week who said that since the guide rib is made of hardened steel they would have to soften it, then drill it, then re-harden it with a heat treat....that was enough to make me run for the door with my Sako bolt in hand.
