I have 4 available. Excellent condition, used less than 5 times each. I prefer the look and feel of polymer mags and would like to trade for P-mags. Don't care which Gen M2 or M3, window or no window. $40 for all 4 cash price. Will trade 2-for-1 towards P-Mags. Excellent deal since these actually retail for more than P-Mags do.