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Posted: 9/11/2010 6:19:40 AM EDT
So I just bought this bolt off of the EE. Was supposed to get a BCM bolt ended up with this one with the letter MPXC on it. After doing some research I found that the "X" was a date code manufactured by Colt. But one thing that surprised me about the bolt is that it has a one-piece gas ring on it. Did Colt ever install these on their bolts from the factory? I didn't think so. Coincidentally I was reading through a document I downloaded here about the Navy's CQB 10" receiver. It appears that they used bolts with one piece gas rings in those. Can anyone offer any insight? Below is the document I am referring to.

http://drop.io/ogdfbvh




Link Posted: 9/11/2010 6:50:58 AM EDT
I dont know for sure but its probably a mcfarland ring or gapless gas rings.
Link Posted: 9/11/2010 6:58:48 AM EDT
Originally Posted By ChromeLined:
I dont know for sure but its probably a mcfarland ring or gapless gas rings.


Yea it looks like a Mcfarland. The document just says COTS, but that probably means Mcfarland. I thought that the armed forces stuck with regular three piece rings. I have read enough about the Mcfarland causing short stroking that I don't want to use it in my rifle.
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