The fix it sticks torque has an accuracy of +/- 6% (even 10% at high values)
So between 2 disassembly/reassembly of the barrel, a difference of up to 12% (or 20%) can result in the tightening torque
So between 2 disassembly/reassembly of the barrel, a difference of up to 12% (or 20%) can result in the tightening torque