Weighs 6.1 oz, not 6.8 as advertised - Tactical Superiority H4 Buffer

Weighs 6.1 oz, NOT 6.8 as advertised in the pic and the specifications. It's a buffer, it's solid, it's priced right but i needed something heavier, i already have 6.2 and wanted to try these 6.8 but they actually only weigh 6.1 so it does me no good. Should've just went with an adjustable gas block.