I've seen plenty reports of single pins breaking when doing the barrel switch-a-roo. guess that is why greg double pins. Would add that paper shooting switch barrels are seldom cranked like a killing rifles barrels are.
To the question at hand i always throw on a tapered after market lug of one makers or another. Cheap, looks good, and definitely makes pulling from the stock/bedding job easier. Just a win/win situation, IMO.
For the price of a Holland or similar I can't see the worth in machining a factory.
