My Complete BCG weights, too lazy to take them apart:

Spikes Tactical Lightweight NiB -10.5oz
Buffer Technology NiB -10.8oz
Wilson Combat NP3 - 11.5oz
Elite Tactical Advantage NiB - 11.5oz
Black Dawn NP3 - 11.2oz
S&W OEM - 11.3oz
Bushmaster OEM - 11.2oz