r34skyline
CGN Ultra frequent flyer
No offence, but what durability? A pencil barrel is just as strong as the fat pointless profile of a gov barrel without the nose heavy balance and extra weight. They're firearms, not battle axes, shoot the person don't beat them with it. What I see are excuses from people to justify being sold a ten year old design and old inventory at inflated prices.
The current IUR that's available is a very dated design and a fat pig, not to mention it's carbine gas. Monolithic is not the greatest idea and the LMT MRP was a flop. Changing barrels(MRP system) means re zeroing optics, dumb system. There is no need for "rapid" barrel change capability. Swapping tops is easier and faster. Damaged hand guard with a monolithic means changing tops, dumb.
If a guy has no desire to change hand guards than the new IUR/MMR is a slick looking setup. Avoid the issues above and you're golden!
Local
If we want to be technical about the qd barrel thing. Aug has had it for 40 years now. So i dont see it being that groundbreaking to begin with.