I have seven government issued M16 mags I'd like to sell, 3 are marked Kay Industries, 2 are marked Center Industries, and the other two are marked Parsons Precision, and DSL Sanchez. The Sks magazine is the removable 20 round Tapco magazine, only used once. I'd like to sell these ftf. I'd also be open to trading for a box or two of .40s&w. I'm asking $10 per magazine, or best offer. I'm not too sure how much the M16 mags are worth so any feedback would be appreciated. Thanks.