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Rifles, Reloading, Optics, Equipment
Gunsmithing
headspace
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<blockquote data-quote="tobnpr" data-source="post: 2440370" data-attributes="member: 68758"><p>Could be, but shouldn't be...</p><p>Thread crush is minimal when threads (internal and external) are within spec and barrel shoulder and receiver ring are perfectly concentric. There's usually only .001-.0015 crush.</p><p></p><p>When spinning the receiver onto the barrel, it should spin on smoothly then come to an abrupt and solid "stop" when the shoulder contacts the receiver ring- you can feel it when it's correct. If you have a barrel shoulder or receiver face (or both) that aren't concentric only a small portion of the barrel contacts the receiver face initially- then torque forces the rest into contact. This results in a lot more rotation, and decreasing headspace. </p><p></p><p>This is why getting fitment correct is critical if trying to get minimal (go +.001 max) headspace.</p></blockquote><p></p>
[QUOTE="tobnpr, post: 2440370, member: 68758"] Could be, but shouldn't be... Thread crush is minimal when threads (internal and external) are within spec and barrel shoulder and receiver ring are perfectly concentric. There's usually only .001-.0015 crush. When spinning the receiver onto the barrel, it should spin on smoothly then come to an abrupt and solid "stop" when the shoulder contacts the receiver ring- you can feel it when it's correct. If you have a barrel shoulder or receiver face (or both) that aren't concentric only a small portion of the barrel contacts the receiver face initially- then torque forces the rest into contact. This results in a lot more rotation, and decreasing headspace. This is why getting fitment correct is critical if trying to get minimal (go +.001 max) headspace. [/QUOTE]
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