Are you shooting the same lot of ammo as last july ? Ammo varys a bit from lot to lot. I Have the same issues with my original sporter barreled Bmag. At one point it shot great then it went down hill and I have not been able to correct.
I replaced it with a HB version and have had very good consistent results. There is just something weird about that skinny barrel. The heating of the barrel and harmonics just don't work well.
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