I'm building a lower for my AR. The goal is to have a lower which I can run both a 16" 300bo and 223 upper.

I've got a parts kit lined out but I need help with the stock/buffer system.

I want to put a magpul MOE fixed rifle stock on this rifle. Should I go with a rifle buffer tube and spring or go with a carbine tube plus extension with a carbine spring?
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"I shoot ducks." - me