9mm 33 Round Glock Magazine For Trade

I have a 'like new' KCI 9mm 33 Round Glock magazine. I've fired less than 6 33 round loads through it. I bought it to have in my "go-bag" at work (Sheriff's Deputy). I have found it is not practical for those purposes and wish to have another Glock 9mm 17 round in it's place. The spring on this magazine is still very stiff, and with the very little usage I had, I have yet to get a malfunction. I store the magazine completely empty and always have. I will trade straight up for anyone with a Glock name brand 17 round 9mm magazine.