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Old 10-25-2008, 07:51 PM   #1 (permalink)
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AR 80% receiver question

What size hole, how many threads/inch for the buffer tube?
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Old 10-25-2008, 08:15 PM   #2 (permalink)
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1-3/16 16tpi.
Drill/ream to 1-1/8" prior to tapping it.
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Old 10-25-2008, 08:21 PM   #3 (permalink)
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Quote:
Originally Posted by Scott@Rockstomper View Post
1-3/16 16tpi.
Drill/ream to 1-1/8" prior to tapping it.

...goes to sit down with a grainger catalog...

Thanks Scott
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Old 10-25-2008, 08:33 PM   #4 (permalink)
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Skip Grainger on this one, hit Travers or MSC.
Travers page 141 (they have taper, plug, or bottoming, your choice, ~$62 each) or MSC at $90-some on up.
http://www.travers.com
http://www.mscindustrial.com

There's a lot of cool machining info and suggestions on http://www.cncguns.com

I also found that I was hurting for vertical space, so I couldn't use a full length drill bit or reamer--I found a 3-flute aircraft countersink at 1-1/8" diameter instead that did a very nice clean job of drilling that hole, and it's a very short tool.

Last edited by Scott@Rockstomper; 10-25-2008 at 08:35 PM.
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Old 10-25-2008, 09:25 PM   #5 (permalink)
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http://www.midwayusa.com/eproductpag...eitemid=799763
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