That's pretty much it.
It looks like a current production MT lower, other than .154" firecontrols.
BTW, I'd suggest against "creating" any problems with your lower, as Colt is not required to remanufacture a lower for you. They might, but they might not. I know with me, it took 9 months, weekly calls to Customer Service, two different customer service managers, and three buildings. They could have just as easily said "Tough".
Also, if you call, all they will tell you is to "send it in, we'll look at it". They might not do anything for you, other than send it back.