A featurelss build means no flash hider, no pistol grip, no asdjustable stock or forward grip. Eliminating the “evil features” of the scary black rifle.
Think turning a AR platform into something compliant like a Mini-14.
The “Monster Man” grip. It’s a monster all right.
http://www.pewpewtactical.com/featureless-ar-15-rifle-grips-stocks-muzzle-devices/
I had a 14 but, lost it in a boating Accident.