Machining a Titanium AR15 Lower Part 5: Finally Done!



It’s done! In this part I swap over to a new CAM package that allows me to use 3d high speed machining techniques required to finish the magazine well flare. I used BobCAD/CAM pro’s tool paths to make this fairly complex cut. It worked great. I then moved on to anodizing and assembling the entire rifle.

26 thoughts on “Machining a Titanium AR15 Lower Part 5: Finally Done!”

  1. Very nice work!  Being able to machine Titanium on a small mill is no small accomplishment.  Congrats on a job well done!  I like the lines on the lower especially the mag release side.  You can achieve a thicker anodize coating if you can control the water temp and increase the amperage so the oxide will etch deeper into and grow a thicker layer.  As the oxide builds up it takes more amps to continue to build.   The simplest way to keep the water cool is to have a larger bath, circulate the water and keep the cathode gage relatively close.  I would also like to know as many others have already asked; if you would ever consider selling 80% 7075 T6 aluminum lowers?Again beautiful work!

  2. Where did you get your titanium from. I'm starting Sonoran desert institute next month and I've always wanted to build a all titanium rifle..

  3. I Find really nice the work you have done here! and specially honor the incredible amount of work you have invested on it! What I kind of really hate is the fact that after all that work and 4 plus years or you have published, there in only 40K views! I would have expected at least 2 or 3 million views "I guess that not every one have a CNC Minded train of thought!!

  4. Man I would love to have a mill like that, great job on the design and production, really cool piece.

    Just curious how much did the stripped lower weigh? A mil spec 7077 T6 lower weighs 8.5oz

  5. Very cool! I have a mild obsession with Ti, built a custom O/U pistol with it, as well as many small parts, but none of the pieces I've picked up at prices I'm willing to pay are large enough to do a lower, and the stuff is too darn expensive. So my not-aluminum billet AR lower is 4130 steel. I don't have CNC, either, so I kept the profile a little simpler than yours!

    On doing your upper, I don't know what kind of machines you have, but just about any full size knee mill can bore and ream the upper vertically. A smaller mill could if you have a 90° head for it. I actually haven't built a full size upper, but did do a 1/2 scale build from scratch. However, the 3/4" bore in my pack rifle is nearly as long as an AR upper, and that wasn't too bad with a 7" LOC 1/2" 4 fl carbide end mill on the rotary table and then a .7500" reamer.

  6. This is a ghost gun. This right here has ability with a thirty caliber clip to disperse with thirty bullets within half a second. Thirty magazine clip in half a second. 😉

  7. Good job. Long time coming and simply, Wow! Amazing work. Beautiful craftsmanship, patience and perseverance. Keep it up.

  8. Few questions here. Can you take the gun you mill out and build to the range and shoot it? Also if you needed to could you use in home defense? I ask because its not a registered gun,would you get in trouble for using it? I know its completely legal to manufacture but what are the laws in using it legally if need be or is it for to shoot on private property in a deserted area and for when shtf type scenario. Thanks in advance

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