At the last Tanner show, there was a guy selling these lowers in a kit. The polymer felt flimsy to me at the mag well, but it was an interesting concept. The trigger group area was a different color polymer and with the included bit, you just removed the different colored polymer with it until it was gone and you allegedly had the correct dimensions. I'm no expert (hell, I'm not even a novice) on polymers or how one would go about producing such a lower in that fashion, but I can see how someone might think they made the lower, then filled in the area with a different color as a means to produce this product.