[RC one]

The Stoner design has earned its stripes the hard way. I would be hesitant to scrap it just because the design is old. The design works very well despite its age. There is always room for improvement of course. The incorporation of an adjustable gas bleed off valve would be useful for example. and, not to sound like a fanatic, but chambering it in 6.5 Creedmoor would be a huge improvement too.

[Elderberry]

The 6.5 Creedmoor is too large for the AR15 platform. It would require an AR10 platform.

[Erik Latranyi]

The Stoner design has earned its stripes the hard way. I would be hesitant to scrap it just because the design is old. The design works very well despite its age. There is always room for improvement of course. The incorporation of an adjustable gas bleed off valve would be useful for example. and, not to sound like a fanatic, but chambering it in 6.5 Creedmoor would be a huge improvement too.

You made the case for replacing it in your own post.

The successor does not have to be revolutionary, it can be evolutionary or retain many of the design-elements that make the Stoner design robust.

However, there are many newer designs out there that are far, far more superior for a battlefield rifle.