A quick weigh in...

OWL: 10.9oz

Surefire DF w/
Arisaka Offset Scout Mount
Cloud Defensive M-lok LCS
Surefire DS07
18650 battery
8.60oz

Surefire DF w/
Arisaka Offset Scout Mount
Cloud Defensive M-lok LCS
Surefire DS07
123 batteries
8.15oz

Surefire DF w/
Arisaka Offset Scout Mount
Cloud Defensive M-lok LCS
Surefire ST07
18650 battery
7.65oz

Surefire DF w/
Arisaka Offset Scout Mount
Cloud Defensive M-lok LCS
Surefire ST07
123 batteries
7.20oz