He warns people to not buy any 6.8 SAAMI rifle because the throat is shorter than the 6.8 SPC-II - and it is recommended to have the longer throat to shoot all types of ammo - and yet then he tells someone to not get a BLK chamber - even though having one allows one to ensure you are in spec to shoot BLK ammo.
If the concept applies to 300 BLK, it would also apply to 6.8 SPC-II. But pointing that out makes their heads explode.
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R&D for AAC
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