Oh, the ACR? Bushmaster’s “future gun” like the FN SCAR or HK XM8? For me it is an AR or AK. All of those look great but they are too expensive for me and you could replace the upper on a regular AR. I am praying the military adapts something more powerful then the 5.56 Rem.
I went the Saiga 7.62 route.
M14/M1A
M1 Garand
AR-15
FN-FAL
etc.
Hell, the C&R guns, like the Enfields, Schmitt-Rubins, Mausers, and Mosin-Nagants will do to arm the neighborhood to repel a bunch of slack-jawed jackasses from the hood.