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Originally Posted by red-beard
CMMG guys are using 6061-T6 for the reciever, which is cheaper and lower strength.
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Irrelevant.
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DPMS uses extruded 7029-T6 which is closer to 7075, but still less strong. They also do not forge the billet.
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Irrelevant. Seriously.
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Knights must be made out of platinum! They want almost $5K for one!
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Nope, you're paying for the name printed on the side.
I have never seen nor heard of a metallic AR lower failure of any kind. I shoot .458 SOCOM through a Rock River upper mounted on a
polymer lower made by Cavalry Arms. Several hundred HOT rounds through it and the fit is still tight with zero deformation anywhere.
Hell, you can confidently mount a .50BMG upper on a standard (much less sturdy) AR-15 lower without fear of damage.
What you want is a lower that uses the Knights pattern (Magpul magazine compatible). Lower strength is not a concern, unless you plan to use your rifle as a club--in which case your barrel will bend first anyway.
Using the Rock River lower will limit you to RRA components.