Go with the original A4 profile which is basically like a match service profile. It's probably an .850 OD under the HG. The lighter barrels are obsolete these days. They heat up quickly and are less accurate. I would say that you may get about .5 MOA with a heavier barrel and good ammo.
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"There is therefore now no condemnation to those who are in Christ Jesus, who do not walk according to the flesh, but according to the Spirit" Romans 8:1
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