Your average 5.56 NATO round is about 4 grams, so 100 rounds would equal close to 1 lb. your gun would actually be lighter still than many AR platforms. If someone decided to lighten their weapon with Magpul, or other lightweight parts, accessories, sights, it would be quite doable. However, I'd lean towards the 60 rounders for ergonomics. They'd still fit in a double magazine pouch, and are not much longer overall than a standard magazine. It's almost worth it.
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