Piston or DI for a Grendel Build?

[LRRPF52]

Well...FYI...I think the accuracy debate is more scholastic than real. Most modern gun makers making piston guns have compensated for the issues concerning this. But moreover, the Marines adopted the H&K417 and M27 which are piston stroke rifles.

Can you elaborate more on that? This is the first I've heard of them adopting the HK417 7.62 NATO rifle.

I know they augmented the SAW with the M27, but nothing on the 417.