I took a small Dremel grind wheel to the sides where the Davcon (peanut butter consistency kind) and roughed up the sides. I also took a small drill bit and made some shallow holes for the Davcon to flow into for additional hold.

I removed some of the plastic so the Davcon would "stick" to the stock, and yet allow the barrel to seat on the solid Davcon. So....to answer your question, YES, I did remove some of the stock material so I could have at least 3/8" of Davcon material from the barrel to the factory stock.

Dave