Tonight I traded a MT6601 on 2 HK 91 .22 conversion kits. They are factory kits and come in a wood box. Comes with 2 mags and are in very good condition. What are these things worth. I saw them at Knob Creek for $700 each, but figured that was a little high. What is a REALSITC price I should ask on one of them? I am looking forward to putting one of them in my 91. I was hoping to trade the other kit for a new Beta Mag.