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Professional? Polite? Please take that back kind Sir, I dont claim to be either.. thank you and have a lovely evening :)

Yes.. what he said.
If you turn the shoulder off now you may have to ream the chambers again to reset the head space depending on how your smith has set them up. My Desert tech barrels mate up on...

I cant seem to find the mag mod pics other than this one

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https://www.nzhuntingandshooting.co.nz/f15/300-blackout-barrel-length-60532/

Did the smith stamp any witness marks on the action and barrel to align for repeatable head spacing? All of those cartridges only have 2 thou between go and no go so it would be very easy to get it...