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I've been thinking about those for some time.
I had some correspondence with AR Performance after reading a long thread on M4carbine.net about the 9310 alloy bolts. The consensus on M4 was that the 9310 alloy was not as strong as Carpenter 158 (standard bolt steel) but that the design of the super bolt (more material around the cam pin hole, radius at the base of the lugs) was superior.
When I asked AR Performance about it they said that the tempering process they use to harden the 9310 makes it stronger than Carpenter 158 and that Harrison has really pounded on several of the super bolts without having any breakage issues. I haven't been able to locate any direct comparisons, most likely because the ammo cost to test two of them heads up would be too much for most folks (myself included).
Last edited by alorton; 12-09-2010 at 01:09 PM.
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