Up for sale is my practically new 12.5" operator upper. I only fired 200 rounds through this to test function and it works great! The operator is a sweet barrel. It began as a Mike Rock blank and it's damn accurate.
dennys 5.56mm 12.5" operator barrel (m4 ramps) w/ surefire suppressor mount
larue 7.0 FF tube
CMT M4 upper
comparison 10.5 12.5 14.5 18