Ronvella- Thanks. I cut the barrels today, stripped the monoblock and ordered the reamer and tap. The good news is I was able to profile a ER shaw 12Ga CM barrel today that looks like it will work just fine. The bad news is I need a second one. Luckily they are only $120 US. Looks like I will have to bore the chambers to .900, then ream to .906 before running in the tap. Should have the block done by next week and at least one barrel fitted. I will take your advice and solder with high force44. I've used it many times before and have a propane/air Turbo torch so getting a good solder joint shopuld be no problem. Any advice on tinning the barrel and/or monoblock?-Rob