Question on early AR-15 barrels ?

[browningautorifle]

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

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[imarangemaster]

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.

Retro Black Rifle www.retroblackrifle.com

click on "Military Rifles" them click on "Military Components guide"

I suffer from RBRD (Retro Black Rifle Disease) I am finishing a 602 build.