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Update...
I changed the spring with a stiffer, RRA carbine spring (stronger spring than DPMS/Colt). With the H buffer, I got a little blow back, but no where near as much as with the lighter carbine spring. When I added a 9mm, 6.5oz, buffer, it completely stopped the issue.
HOWEVER...now it's too heavy to cycle the loads I had out for testing today. I didn't bring any of the AA1680 with 10.6gr and Hornady 225's that I had been shooting because they have been exiting the bore in transonic speeds in both the 8" and 16" barrels I've got on the AR's.
Last edited by rumlover; 11-06-2011 at 07:52 AM.
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Linear Mode
