JaPes, 10-4, just one of the other options one can do. I thought of just purchasing a dedicated 22LR upper and switch it when I want to shoot the 22LR. But the cost of most uppers are the price of a completed full rifle, or M&P 15/22. I figure, for the price of just the upper, I could have a complete full firing rifle, so it was the M&P 15/22 that won out..