I own a select-fire Powder Springs MAC 10/45 with Sionics suppressor, six mags, a barrel extension and aftermarket SWAT case. The gun and suppressor were purchased at the same time (approx 1969) and have matching serial numbers. They are on seperate Form 4s. I understand that a matched set like this, especially in original, fine condition (as mine are) is extremely rare. I need to sell the items. Any suggestions as the best way to do that.....and any idea as to what price I should ask?