[Rebelgecko]

You can even build an AR-15 without a CNC machine. It's doable with a hand drill, although will look nicer and may function better if you use a drill press or router. There's a video on youtube of a guy that made an AR-15 out of beer cans, although he had some blacksmithing equipment if I remember correctly.

[roel_v]

If this is the same video we're talking about, he 'just' melted down the beer cans into a block of aluminum and then machined a lower from it, right? (and he also made a video where he melted down spent brass and machined an AR lower from it) If so, that melting down can be done using $15 of home depot materials (metal bucket, thermal insulation wool or cement, 2 propane burners)

(DIY metal smelting/foundries are a great way to waste a few hours watching Youtube videos)

[anth_anm]

saw a guy who made one out of old casings.

Really cool. He had a milling machine though.