Thanks to all for the help!!! I went to a friends shop the other night and he had a couple diff ones there so we matched em up and sure enough there are two different heights. The next day I went back to the store I purchased the gun and sights at and they actually had the one I needed this time and swapped it out no charge. I was kinda surprised because I had bought a utg for $40 and he swapped for a bushmaster one that was $89 and said have a nice day!
Any way it all worked out for the best, I was able to take my combative rifle class today