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Old March 12, 2019, 14:47   #1
nismobishi
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Locking shoulder question.

Hi guys. I'm measuring the factory locking shoulder that came with my imbel kit. The only mark on it is a small x. I measured the small flat and it measures .261 around the middle where the wear marks are and .2615 toward the ends where where the black finish still exists. I'm not sure weather to call this a .261 or a worn down .262. Any suggestions?
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Old March 12, 2019, 14:55   #2
308/223shooter
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Use pin gauges to determine the size you need after barreling your receiver. The receiver/barrel combination you use may require a larger or smaller locking shoulder.
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Old March 12, 2019, 15:12   #3
nismobishi
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Quote:
Originally Posted by 308/223shooter View Post
Use pin gauges to determine the size you need after barreling your receiver. The receiver/barrel combination you use may require a larger or smaller locking shoulder.
I bought a set of pin gauges and a set of headspace gauges. I'm waiting on my 10 day waiting period to pick up my receiver from the ffl (stupid california)... I just wanted to know what size my factory shoulder is.
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Old March 12, 2019, 16:19   #4
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Call it either,....half a thou is outside of the precision necessary for any purpose. I've got a box full of unused .261's and they range from .260 an an arf to .261 an an arf.
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Old March 12, 2019, 20:04   #5
nismobishi
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Call it either,....half a thou is outside of the precision necessary for any purpose. I've got a box full of unused .261's and they range from .260 an an arf to .261 an an arf.
Thanks! I'm confident that it's a .261.
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