I do not see why not Daniel Defense gets away with it. However I'm sure the experts will be along shortly.
https://danieldefense.com/daniel-defense-m4-carbine-isr-mil-spec-tm.html
I feel your pain. I'm so deep in a house remodel/rebuild I have a 2x4 strapped to my *** so I won't fall in! If not I would be interested! Picture of my Kitchen and dining room!