Didn't see a post about this (not that the search function would have found it) so I thought I would ask. Went to assemble a CTI M2045 Blue Streak (6 gr) at our club launch two weeks ago and all the grain spacer O-rings were the wrong size. Someone on the assembly line had mistakenly packaged all 6 grains with the closure O-rings instead, which are too fat and too big in diameter to fit in the liner. I can't even begin to express the frustration with this. You drive five hours, camp three days only to have your biggest launch of the year frustrated by O-rings. This was one of a handful of 75mm motors I ordered over the Black Friday weekend so, when I got home I looked through all the other 75mm motors I have on hand. I found a 3 gr L1050 Blue that also had the wrong size. Both motors were manufactured Nov 22 2017. I have other 75mm from other earlier dates that were all good (some whites, classics, skids and another blue) I'm curious if anyone else has run across this problem, or if it's isolated to this manufacturing date/lot? One more thing to add to my check list before heading out to launch. Also, I've contacted the vendor I purchased from and he's sending me replacement O-rings. And, for the curious, yes, I asked a lot of other attendees if they had extra (sometimes you don't need the last o-ring) but I couldn't scrounge up enough. I had one extra in my box.