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AR headspace independent from the bolt?
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Topic: AR headspace independent from the bolt? (Read 783 times)
AZRedhawk44
friends
Senior Member
Posts: 13,991
AR headspace independent from the bolt?
«
on:
June 02, 2011, 06:36:51 PM »
Looking at this product:
http://www.bravocompanyusa.com/BCM-16-Mid-Length-Upper-Receiver-Group-p/bcm-urg-mid-16.htm
The BCM Standard 16" Mid Length Upper Receiver Group
To my understanding, there's a paradox in their product description:
Made by Bravo Company MFG, Inc. (BCM®) These Barreled Upper Receiver Groups are designed for shooting professionals with the Mil-Spec features for the demands of their duty. They are fully assembled,
headspaced
, and test fired. These
do not include bolt carrier groups
or charging handles.
How can an upper receiver group be "headspaced" if it doesn't come with the bolt?
I'll admit to being predominantly an M1 and M14 shooter and rather new to the AR-15 scene... but the bolt contact surfaces are a major component of headspace, to my understanding.
Can anyone enlighten me?
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bedlamite
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friend
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Posts: 9,826
Ack! PLBTTPHBT!
Re: AR headspace independent from the bolt?
«
Reply #1 on:
June 02, 2011, 07:11:16 PM »
They are
assuming
you use a bolt that is in spec, the headspace is set by the barrel extension when it's assembled.
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Is defenestration possible through the overton window?
Monkeyleg
friend
Senior Member
Posts: 14,589
Tattaglia is a pimp.
Re: AR headspace independent from the bolt?
«
Reply #2 on:
June 02, 2011, 07:36:11 PM »
A bottleneck cartridge headspaces on the case shoulder, so they've probably measured back from the shoulder portion of the chamber to where the bolt
should
be when it locks up.
I just said the same thing as Bedlamite, but worded it differently.
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Dick
Glock Pistols
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brimic
friends
Senior Member
Posts: 14,270
Re: AR headspace independent from the bolt?
«
Reply #3 on:
June 02, 2011, 08:40:51 PM »
New barrel+new bolt= no worries.
Some places do headspace the barrel/barrel extension to a specific bolt, but those are custom match barrel jobs.
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AR headspace independent from the bolt?