What unit? Our gunners mates? The VBSS school house? You’re saying they took off the 6 position and replaced them 4 position tubes? LOL They literally came in boxes from Crane to the ships, I was there when we opened and inventoried them.
So, like I said, I’ve personally seen about 75 or so Mk18’s and used about maybe 6 different ones...all had 4 position tubes. In addition, none had QDSS mounts as we didn’t have suppressors, no peq’s either as we didn’t have NVGs either. I know it’s contrary to What everyone reads on wikipedia, but information on there isn’t written in stone.