If you post in their forum on TOS you will more than lilkely get a very quick response. The owner and his shop guys answer questions there about work all the time and after "normal" business hours etc..
I finally got in contact with ADCO today on the phone. I spoke with Steve and according to him the hole in the muzzle won't do much of anything to the rifle's function and accuracy. On his advice I pinned a BCM A2X FH and welded the spot. His exact words were, "I dare you to notice any difference in that upper and another Colt without the extra hole." Keyholing and the like will happen only after the throat burns out. He says the hole in the muzzle will fill with carbon and I won't notice any difference. I'm not recommending others here drill through into the bore but I'm very glad my faux pas was catastrophic in the end. :jester:
Great news Davy,
I thought that would be the case.:smile:
That is good to hear. :)
Who knows, you may be a trend setter...;)