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AR15.COM
9/14/2023 9:58:34 PM EDT
CMMG offers a set of tuning weights for their radial delayed blow back bolt. Has anyone used them? I assume if you use the heaviest weight it will slow down the bolt speed.
10/27/2023 5:46:44 AM EDT
[#1]
I'm using the medium one.  It runs my suppressor with my 147gr and 158gr ammo.


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