I though Carpenter 158 was the mil spec steel specified. MPI is a good thing but you do know that KAC believes that firing a high pressure round during testing shortens bolt life by up to 50%. They don't proof their bolts and warranty them for I believe 22,000 rounds.
“The Trump Doctrine is ‘We’re America, Bitch.’ That’s the Trump Doctrine.”
"He is free to evade reality, he is free to unfocus his mind and stumble blindly down any road he pleases, but not free to avoid the abyss he refuses to see."
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