Ghost Gunner As shipped, Ghost Gunner manufactures mil-spec AR-15 and AR-308 lower receivers to completion. With simple tools and point and click software, the machine automatically finds and aligns to your 80% lower to get to work. No prior CNC knowledge or experience is required to manufacture from design files. Legally manufacture unserialized AR rifles in the comfort and privacy of your home. Read the reviews and see this as feasible. Fed-ex won't deliver or so I heard.