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What are the pros and cons of different manufacturers? I know Black Rain uses solid aluminum billet machine milled rather than forged for the lowers which, in theory, makes them stronger and lighter.
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Weight and strength advantage go to the forged part. To achieve the same strength in a billet part it needs to be thicker. Billet can be stronger but requires additional material.
Billet has the advantage of having custom features. Ambi controls, 45* selectors, flared mag wells, just a few of the different things found with a billet part.