The quick change barrel feature is not one of the reasons I love the MRP but it's still nice to have that feature. It makes cleaning the barrel, in particular the chamber and locking lugs, a lot easier. Return to zero with the same barrel is pretty darn good, but swapping to a different barrel will usually require re-zero of the optic in my experience.
Yes, you could put together a cheap standard upper for a little more than the cost of an MRP barrel straight from LMT. But the resulting assembly won't be nearly the quality you get in the MRP in my opinion. And keep in mind, the MRP barrels are *very* good barrels.
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