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AR15.COM
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9/4/2011 1:05:00 PM EDT
Where can I get a castlenut like the old style XM77?  In millspec dia.

Mike
9/4/2011 1:15:35 PM EDT
[#1]
SARCO comes to mind.
9/4/2011 1:16:38 PM EDT
[#2]
Assuming your talking about a lock ring (known as a castle nut on modern carbines) for the XM177E1 or E2 or an SP1, check the  EE for parts sold by boywonder777.
9/4/2011 5:13:18 PM EDT
[#3]
Bushmaster makes them and they finally filled my backorder from a couple of months ago.  They are black but you can naval jelly them if you want an lighter gray color to them.  The ones I just got match my colt one pretty well, just a little darker than the colt one I have.  Bushmaster Part number 5310-917-1153 CAR receiver extension nut.
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