No idea of the Parker VH, but building double rifles out of shotguns is rife with issues. Pick only suitable shotguns, there are reasons why double rifles cost a lot more than double shotguns. Also be aware that some of these shotgun into rifle conversions that are "wonderful" are sold and re-sold again and again sometimes for reasons. I know of one or two which seem to have had four or more owners over say a ten to fifteen year period.

An Aussie gunmaer made a few out of Greener Empire shotguns. I spoke to him about getting him to do it for me. He said, one, it will cost just as much as buying a rifle anyway, and secondly, wouldn't do it again for liability reasons.

Its not worth it to "cut costs", buy the real thing.

Of course some gunmakers on here do it for themselves, having the skills and abilities themselves to decide what is suitab;e, and how to do it.