The new bare primer bolt setup is $99 plus the cost of the internals. This conversion will be bare primer ONLY. It looks like this.
The old style used a Extreme bolt and an adapter that goes in the Extreme bolt. I think i know where to get the old style adapters with the REAL lehigh breach plugs for around $45 plus vent liners. Ventliners are $3-$5 each depending on brand.