The M1 Carbine is the standard by which all PDWs are measured.

[SHORT-N-SASSY]

In retrospect, perhaps I should have referred to another link: < https://shwat.com/308-vs-6-5-grendel/ >.

In any case, I think it's fair to state that a Kel-Tec RDB in 6.5mm Grendel would be well received by our sport-shooting world.