My 2nd post on the hide. I'm on a roll. K, heres the question in my quest for more accuracy. I've put together more than a couple ARs over the years and to me, getting the gas tube to line up pretty much determines the torque. However, research says 72 ft-lbs of torque. Not absolutely sure that is the correct number, just to lazy to go find it and come back. There are times when I've had good line up for the tube and a snug fit, 72 ft-lbs? prob not but to go one more tooth I feel would do damage. What is the answer? crank away or maybe take that one tooth out and be precise about it. Thanks
Gunsmithing AR barrel nut question
- Thread starter NEWTOLR
- Start date
Re: AR barrel nut question
I torque mine to 30lbs,check alignment and just move it to the next hole.
The specs as i know them are min 30 and to not exceed 80.
It is my understanding the variance is due to variations between barrel makers.
Also,are you taking into account the compound leverage of the torque wrench attached to the barrel nut wrench ?
RK
I torque mine to 30lbs,check alignment and just move it to the next hole.
The specs as i know them are min 30 and to not exceed 80.
It is my understanding the variance is due to variations between barrel makers.
Also,are you taking into account the compound leverage of the torque wrench attached to the barrel nut wrench ?
RK
Re: AR barrel nut question
I put mine at 50. Seems to be a good middle ground.
I put mine at 50. Seems to be a good middle ground.
Re: AR barrel nut question
I have seen initial barrel nut torque values of both 31 & 35 lb/ft. The procedure taught at the last armorer school was:
o lightly coat threads on upper with high-temp grease (we used Super-Lube)
o torque to 35 lb/ft and loosen, two times.
o torque to 35 lb/ft and check tube hole alignment.
o if not aligned, continue tightening (not to exceed 80 lb/ft) to point of alignment.
Ensure you are using the correct upper fixtures to prevent damage to the upper.
Kevin
I have seen initial barrel nut torque values of both 31 & 35 lb/ft. The procedure taught at the last armorer school was:
o lightly coat threads on upper with high-temp grease (we used Super-Lube)
o torque to 35 lb/ft and loosen, two times.
o torque to 35 lb/ft and check tube hole alignment.
o if not aligned, continue tightening (not to exceed 80 lb/ft) to point of alignment.
Ensure you are using the correct upper fixtures to prevent damage to the upper.
Kevin
Re: AR barrel nut question
I've never had a problem with 30 and align.
I've never had a problem with 30 and align.
Re: AR barrel nut question
40-50
40-50
