This looks pretty cool. Basically an AR with no buffer tube and buffer spring, so attaching a folder is easy. Interestingly enough, Brownells says they can't ship these to MD.
https://www.brownells.com/guntech/foxtrot-mike-fm-15-gen-2/detail.htm?lid=18500
https://www.brownells.com/guntech/foxtrot-mike-fm-15-gen-2/detail.htm?lid=18500