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Old February 27, 2020, 09:20 PM   #11
dakota.potts
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Join Date: February 25, 2013
Location: Keystone Heights, Florida
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I'm assuming T. O'Heir means to say that most receivers are cast or forged and then finish milled, as opposed to being machined from aluminum billet stock from operation 1.

As stated, there have been AR lowers in steel (and titanium, magnesium, and probably a few other metals). There's really no need for it in the AR design as steel is heavier, more likely to corrode, and takes longer to machine (more expensive) and the AR lower really does not receive much stress.
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