Went back to the range yesterday after a complete disassembling and reassembly. Took 175 SMKs and Hornady 165 SPBT. No good!
I'm waiting on replies from one barrel maker and one suppliers.
Anyway. In my search for information I found this video. I won't be installing one but I thought it was an interesting device.
http://youtu.be/DhRIebOY4Jk