re: Does it make sense to add a nice upper to a Stag lower?

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The lower is just a machined block of steel

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I think the majority of them are aluminum. I'm sure that's what you meant.

But yea I agree with others. Besides triggers, pretty much every other piece of hardware is the same. Well, some rifles have ambi mag releases and bolt releases so those are definitely different. But for the most part, it's just a machined piece of metal with some other small metal parts in it. The buffer tube is the same way.