5.56/.223 function in a Grendel Mag?

[mel]

i never tried that , but at one point when buying mags for my ar-10's i accidently purchased 2x 10rd ar-15 5,56 pmag's mags instead of the ar10 pmag's mags , and they will hold 6 grendel rounds and function just fine in the grendel , the downside is the pmags dont allow 2.260 oal its more like 2.220 iirc so i use them for my 90g tnt loads which are loaded to a 2.195 oal , and i keep them around for my 5.56 as well