I wrote a review of the Lucas bore guide and I get inquiries about difficulty in acquiring one due to various issues (e.g. communications, lead-time, etc).
But I found a pretty good alternative by PMA Tool:

Two piece design: Black Delrin body, blue anodized aluminum insert.
I know some people cite the white Delrin Sinclair guides. I have those one-piece versions, but I tried their two-piece version and at least the insert I acquired for that one (30cal) was bored in such a manner that the insert doesn't result in a centered channel for the rod.
But I found a pretty good alternative by PMA Tool:

Two piece design: Black Delrin body, blue anodized aluminum insert.
I know some people cite the white Delrin Sinclair guides. I have those one-piece versions, but I tried their two-piece version and at least the insert I acquired for that one (30cal) was bored in such a manner that the insert doesn't result in a centered channel for the rod.
