AR 15 Barrel Tenon ??

C

colchester

Member
Couple of questions on ar-15 barrel tenon. How much clearance between bolt nose and breechface? What are the details on the chamfer on the breechface, what angle and how deep does the chamfer go? TIA
 
Dimensions are typically .620-.621" tennon length which leaves .008-.009" gap between the bolt face and barrel. The chamfer is spec'd out on the drawings I've seen as a 30 degree chamfer (from perpendicular) and I believe it's .050" from the chamber edge. I usually cut 25 degrees, .050" out and have had no problems with function in any number of calibers on the AR.
 
I was told and use 100` chamfer at a max diameter of .500" for cases in the .378" size. On my lathe this setting reads 40` because my zero is actually 90` from centerline.
 
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