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AR-10 vs AR-15 buffer tube threading spec?


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Just recently I acquired smoke composites buttstock to be paired with Wilson combat AR10 lower. After threading the buttstock into the lower I’m seeing that the threads have minimal engagement between the two surfaces and there is substantial play. I was told by both manufacturers that the combination would be compatible.  

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Right now I have wilsoncombat  factory ar10 buffer tube, smoke composite Millspec carbon buttstock and two WC ar10 lowers. Just out of desperation I did uninstall bustock tube from my factory built AR10 so I could see how their factory tube fits inside their setup and to my surprise the thread engagement isn’t great. I’ll try to record a video today to show the play between tube and lower. 

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4 hours ago, Armed Eye Doc said:

I would try the new tube in the good lower first.  From what you have said so far, I suspect the new lower is the out of spec part.  You might not need to measure.  It could be tolerance stacking between parts and measurements would confirm that.

This. You don't need a machine shop. If multiple tubes fit correctly in one lower, and multiple tubes do not fit correctly in other lower....welp, problem solved with 5 min of work. 

Edited by blue109
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The SC tube was tested on another AR10 lower form WC and it was the same result. Still loose and thread gap was excessive. 

Castle nut was used along with its respective counterpart, even tho it eliminated the slop I wouldn’t trust those threads with so little contact between them.



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