I sent them an email to ask about opening up the fore end to fit my varmint barrel and was told that it would work. When I called them on the phone to place the order the rep put me on hold to double check before taking the order and then came back with the news that the new stock would not work with a varmint barrel. Not enough wood in the fore end. I imagine that it may have something to do with the lamination process . There would only be 1/8 inch of wood on each side of the barrel. My varmint barrel is a McGowan and is almost 1 inch in diameter at the end of the stock.