01-29-2014, 02:48 PM
(This post was last modified: 01-29-2014, 05:56 PM by Keep The Change.)
AR-15.com used to have a pdf linked that I bookmarked for the technical assembly manual. I think the manual ID is TM9-1005-319-23.
So if you can find that somehow, that is the military technical manual. I believe the torque in the manual was is in the range of 30-80 ft lb for the barrel nut.
Below I linked a how to from Midway discussing upper assembly.
http://www.midwayusa.com/general.mvc/ind...r-15-rifle
The last barrel I put on ended up being around 50 ft lbs. It took that much to get to a gas tube hole. Sneak up on the gas tube hole. Don't pass it up then back off the nut a little. This has potential to cause the barrel extension lug to rotate back as well due to clearance between the alignment dowel and the upper alignment groove. If you pass up the gas tube groove you want, back it off a fair amount and sneak up on it again.
I learned this the hard way and caused a slight misalignment and interference between my bolt and lugs in the extension.
So if you can find that somehow, that is the military technical manual. I believe the torque in the manual was is in the range of 30-80 ft lb for the barrel nut.
Below I linked a how to from Midway discussing upper assembly.
http://www.midwayusa.com/general.mvc/ind...r-15-rifle
The last barrel I put on ended up being around 50 ft lbs. It took that much to get to a gas tube hole. Sneak up on the gas tube hole. Don't pass it up then back off the nut a little. This has potential to cause the barrel extension lug to rotate back as well due to clearance between the alignment dowel and the upper alignment groove. If you pass up the gas tube groove you want, back it off a fair amount and sneak up on it again.
I learned this the hard way and caused a slight misalignment and interference between my bolt and lugs in the extension.