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Posted: 1/4/2003 4:55:11 PM EST
I picked up a barrel extension today at a gun show...I can see that it is 16 TPI, but what size diameter is it???

It looks like it might be 13/16 x 16 TPI...Which I have never heard of...

...???...
Link Posted: 1/4/2003 5:12:45 PM EST
.8125-16 TPI.
Link Posted: 1/4/2003 5:17:20 PM EST
Originally Posted By SBR7_11: .8125-16 TPI.
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Thank You! [:)] ...That sounds like you're reading it right off your digital verniers... [:D] Isn't that kind of an oddball size??? (Why would anyone pick such a strange diameter???)...
Link Posted: 1/5/2003 12:29:01 AM EST
O.8125x16 UN but is it 3A orB............? [NI]
Link Posted: 1/5/2003 6:15:52 AM EST
Originally Posted By postino: ...That sounds like you're reading it right off your digital verniers... [:D] Isn't that kind of an oddball size??? (Why would anyone pick such a strange diameter???)...
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No, looking at the drawing from an old NRA article titled "Heavy Match Barrel Enhances AR-15 Accuracy",, with pic of Experimental M16A1 match rifle built by USMC Armorers at Quantico in '72. Give step by step instructions to machine an AR/M-16 barrel from a blank.
Link Posted: 1/5/2003 6:23:56 AM EST
Originally Posted By SBR7_11: No, looking at the drawing from an old NRA article titled "Heavy Match Barrel Enhances AR-15 Accuracy",, with pic of Experimental M16A1 match rifle built by USMC Armorers at Quantico in '72. Give step by step instructions to machine an AR/M-16 barrel from a blank.
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SBR7_11 - Is that article available on-line anywhere??? I'd be very interested in reading that...
Link Posted: 1/6/2003 10:14:40 AM EST
[Last Edit: 1/6/2003 10:17:03 AM EST by Russ4777]
Per ARDEC Drawing 9349054 for the current 20" A2 barrel, the specified barrel thread for the extension interface is ".8125-16UN-3A-MOD"
Link Posted: 1/6/2003 1:11:39 PM EST
Thank you all!!!
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