Is the bolt not headspacing correctly something that occurs frequently among quality parts makers such as Daniel Defense or BCM?
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Is the bolt not headspacing correctly something that occurs frequently among quality parts makers such as Daniel Defense or BCM?
Actually, I've never even heard of a new bolt not headspacing correctly in a new upper.
Never, ever.
That doesn't mean it doesn't happen, and maybe someone else can add input.
My understanding is that a properly made bolt (dimensionally correct) will always headspace correctly in a barrel which was setup correctly.
IE: It's the barrel to extension relationship alone which determines headspace if the bolt is dimensionally correct.
I'll defer to the hardcore armorers on how often barrels are not setup correctly or bad bolts are released. My experience has been all but the fly by night bottom feeders get this right. I can't see DD letting a dimensionally incorrect bolt past QC.
Of the 8 uppers (mostly BCM and LMT) I've purchased or built, none of them closed on a USGI field gauge. The same can be said for the 2 uppers that my cousin sourced from DTI and Armalite that I checked for his piece of mind. Iraqgunz or Grant would be the ones to ask about this.
I have never had it happen with a new quality weapon. I assisted an armorer on another contract in Iraq doing some checks of the new Colt M4's that they received to replace their previous weapons.
Not one of those failed. As a matter of fact the only issue I recall was one loose FSB.
None of the AR's that I have put together either for myself or others has failed to pass either. If you are using KNOWN QUALITY manufacturers that chances are probably slim to none. Since I have the gages, I check everything regardless.
Thanks for the info
Like everyone else above, I've not seen it.
Apparently none of you have toured OLYMPIC ARMS? :jester:
Assuming both the bolt and barrel are new here, this should not be an issue. On mil spec parts you can easily put a gun through 5K rounds before even having to worry about head space being an issue. I would check your gauge ensure it is still within tolerance, or borrow someone else's just to double check. .001 th of an inch is the difference between success and failure here, I'd want to be sure before I called the company and gave em an ear full.