[stagpanther]

Gas piston rifle? I'll go out on a limb and suggest an M14 / M1A.

You can choose barrel length, weight, ROT, and caliber. (.308 or 6.5)
Smith Enterprise has the better parts, and treatments that make for a low maintenance, easy to clean reliable rifle that has great repeatable accuracy.

Multiple stocks are available in wood, synthetic, composite, and light weight aluminum chassis stocks. You can have a butt stock that is fixed, retractable, or even a folder. You can even use a high butt stock adapter on the lightest aluminum chassis stock that redirects the recoil impulse straight back into your shoulder.
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The History and Development of the M14 EBR

One day, maybe. always thought they were a bit pricey but definitely class.

[I know you said you settled on the 25prc, but if your still interested in a quarter bore ar, you could look into the 25gpc, general purpose cartridge. One of the channels I watch built one. Interesting little thing
https://youtu.be/zgQFo7fwHic

That does look intriguing--I've long thought the 6.8spc is one of the best AR15 hybrid designs ever made for the platform.