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Armalite AR10 Gas Rings

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Took an AR10-B Carbine in trade and on disassembly the bolt was very loose,

It has McFarland Gas Ring installed and checking with micrometer showed Dia. of ring to be .628"

Armalite states that they should measure .646 to .649.

Should I just replace the rings and then shoot it or shoot it and see how it performs first, if this is safe to do?

Also I am at a loss to decide which rings to use McFarland or 3 piece as there are many conflicting views on which are the best.

Any advice would be appreciated.



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Hi Dura My take is always shoot em first before replacing parts....the rifle should have plenty of gas pressure.......if you want to change em because the rifle doesnt cycle or you just want to....I would replace em with Armalite rings...but any 3 piece ring set would do...I would think.....the ring set brand is nothing to worry about :) Wash

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If I remember correctly, the McFarlands are loose to begin with . Now that measurement you have ,may be for the std type rings . If you take the assembled BCG & flip it from the bolt pointing up to bolt pointing down & the bolt doesn't move , it should be OK . Any movement , there may be a problem . I also have read of some not even using rings & not having problems . ( yet )

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