Question on early AR-15 barrels ?

**RCS** · 06-16-2011 10:07 AM

The early AR-15 barrels had a twist of 1:14, did they also have 6 grooves ?

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**Highly Recommended** · 06-16-2011 10:07 AM

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**ohno** · 06-16-2011 11:45 AM

See the table 2/3 the way down this page for barrel twist rates on various AR-15/M-16 models:
M16 rifle - Wikipedia, the free encyclopedia

**Johnny Peppers** · 06-16-2011 08:56 PM

My three digit is 1 : 12, and is six groove.

**browningautorifle** · 06-16-2011 10:04 PM

I think he's talking about the test pattern rifles.

**imarangemaster** · 06-17-2011 08:43 AM

Yes, 1/14" 6 groove, RH twist. early model 601 AR15 (full auto). Winchester made the barrels. The 601 had the early "duckbill" thin three prong FH and triangle charging handle, the 602 model had the beefed up three prong, the current design charging handle, and switched to a 1/12" twist.

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**jmoore** · 06-17-2011 08:53 AM

Originally Posted by ohno

See the table 2/3 the way down this page for barrel twist rates on various AR-15/M-16 models:
M16 rifle - Wikipedia, the free encyclopedia

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**GUTS** · 06-22-2011 08:34 PM

The early 601 barrels were made by Winchester, after that they were made by COLT. Some of the later Model 601s had 1/12 twist barrels.
See here:0Colt's USGI M16 series variation guide edition IV - AR15.COM

It's the part I am missing to make this one correct,(except of course the reciever)mine has an MP marked barrel.

**RCS** · 06-24-2011 05:56 PM

When I posted a photo of the barrel and carttridges I wanted to ask about the GB 73 headstamp on the 223 cartridges. Where these produced for the military or commerical market/or both ? Have these Greenwood & Batley 223 cartridges been around for a period of time ?Attachment 24132

**jmoore** · 06-24-2011 06:25 PM

Originally Posted by RCS

Have these Greenwood & Batley 223 cartridges been around for a period of time ?

Those particular ones? 1973

**RCS** · 06-25-2011 10:40 PM

Correction on the manufacturer of the 223 cartridges with the GB headstamp, they are Chartered Industries of Singapore

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