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  1. #1
    jodifu6274 is offline Plastic
    Join Date
    Jan 2011
    Location
    Connecticut, USA
    Posts
    15

    Default Question about finishing AR lower with a drill press

    Hi ! I have an 80% AR-15 lower receiver and jig from tactical machining, and I've been told that many people finish their lowers with a drill press. One poster at the TM forum (from TM) suggested that I drill out most of the rear fire control pocket with a drill bit, then plunge out the areas between holes with a 3/8" end mill. CNC guns makes a plate with pre-drilled holes (not made for the TM jig, but apparently can be modified for it), but it costs $125. As I'm only making one receiver, I'd rather not spend the $125 if I can get by without it. TM says that I can just drill within their top plate. Here's a link to the CNC tutorial: CNCGUNSMITHING - www.cncguns.com - AR15 80% Lower Receiver Tutorial
    here's a link to the TM site:TacticalMachining.com • View topic - How to properly put the jig together (photo intensive)
    How would you recommend I proceed with a drill press? Should I make some sort of template to replicate CNC's drill-milling jig, or just try to carefully place some 1/8" holes, then drill them out with a 3/8" drill as per the CNC tutorial? Do I need an xy table, or do you think I can get by with just a vise? Finally, what specific type of two-flute 3/8" end mill should I use? I know this probably seems sloppy and amateurish to most of you, but until I can afford a mill (which I'm working on), I'll have to rely on this for my first build. Thanks!

  2. #2
    USMCPOP is offline Titanium
    Join Date
    Jul 2005
    Location
    Midlothian, Virginia
    Posts
    2,610

    Default

    We bought a very nice 100% Aero Precision lower for $85.

  3. #3
    jodifu6274 is offline Plastic
    Join Date
    Jan 2011
    Location
    Connecticut, USA
    Posts
    15

    Default

    I decided to do it right and got a mill.

  4. #4
    gunbuilder is offline Aluminum
    Join Date
    Jan 2005
    Location
    NE South Dakota
    Posts
    212

    Default

    jodifu6274,
    I think that is a very good idea, just don't get too small a mill/drill. Some are more like a toy than a tool.
    Thanks,
    Paul

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