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quick googling shows an actual HK 416 weighs about 8.5 lbs loaded. I assume they were trying to mimic the weight of the real thing. But then again I am looking at the older model with 4 picatinny rails manual and they state that HK 416-22 weighs 6 lbs empty.
This newer version has a flat top picatinny rail and 3 mlok rail sides which should make it lighter. I guess the description is wrong? Wouldn't be surprised if it was.