My Torque Values:
AR Compensator (Flash hider) No Torque, timing value with the procedure in the Army TM. Hand tight and then tighten a minimum of 90 degrees but no more than 450 degrees to timing. Don’t over tighten, don’t loosen.
AR Barrel Nut 30 Ft. lbs. Minimum, not to exceed 80 Ft. Lbs. to align the next slot in the barrel nut. The 80 Ft. Lbs is not stated in the TM, but I don’t know how you would line up the gas tube, without going over 30 Ft. Lbs. Unless you use shims. I don’t think most folks will have any laying around. This torque spec is common across the community and internet.
AR Carrier Key Screws 50-58 INCH pounds torque
AR Lower Receiver Extension (Buffer Tube/Castle Nut) 40 Ft. lbs for both Rifle and Carbine.
M-LOK Accessories:
For attaching metal accessories to metal hand guards: 35 in/lbs
For attaching polymer or metal accessories to polymer hand guards: 15 in/lbs
For attaching polymer accessories to metal hand guards: 15 in/lbs
The installation torque values are not minimums, they are recommended limits. The nylon patch compound may slightly affect the torque reading if using an in/lb torque wrench.
Using a small hex wrench should prevent over-tightening. Remember that the recoil lugs are doing most of the work, and excessive torque on the nuts is not required
My Comments:
The rest of the items in the research below I could not find in the Army TM, manufacture website or in common reference. Until I can find it, I am going with ‘tight’ and the appropriate thread lockers. ‘Tight’ might be the values listed.
I am not saying that the info below is wrong or bad. I could not readily verify it. The above is what I will use, at the end of the day I am responsible for my decisions and you are responsible for yours.
########### RESEARCH ITEMS BELOW ###########
AR Compensator (Flash hider), 15-20 Ft. Lbs. Torque *1
AR Compensator (Flash hider) *3 (No Torque, timing value)
AR Handguard Screws, 20-30 inch pounds torque *1
AR Gas Block Set Screws, 25-30 inch pounds torque *1
AR Barrel Nut, 30 Ft. lbs. Minimum, not to exceed 80 Ft. Lbs. to align the next slot in the barrel nut. *1 *5
AR Barrel Nut, 30 Ft. lbs. *3 (I cant find the 80 Ft. Lbs. In the TM)
AR Carrier Key Screws, 50-58 INCH pounds torque *1 *2 *3
AR Grip Screw, 15-20 inch pounds torque *1
AR Lower Receiver Extension (Buffer Tube/Castle Nut)
Rifle: 35-39 Ft. Lbs. *1 *3
Carbine: 38-42 foot pounds *1 *3
M-LOK Accessories: *4
For attaching metal accessories to metal hand guards: 35 in/lbs
For attaching polymer or metal accessories to polymer hand guards: 15 in/lbs
For attaching polymer accessories to metal hand guards: 15 in/lbs
The installation torque values are not minimums, they are recommended limits. The nylon patch compound may slightly affect the torque reading if using an in/lb torque wrench.
Using a small hex wrench should prevent over-tightening. Remember that the recoil lugs are doing most of the work, and excessive torque on the nuts is not required
KeyMod Accessories: *1
Polymer to metal: 15 in-lbs
Polymer to polymer: 15 in-lbs
Metal to metal: 30 in-lbs
Picatinny Accessories: *1
Polymer to metal: 15 in-lbs
Polymer to polymer: 15 in-lbs
Metal to metal: 35-60 in-lbs
Ref:
*1 https://www.youtube.com/watch?v=Ah6WISs6IfY
*2 https://www.youtube.com/c/InstructorChad
*3 ARMY TM 9-1005-319-23&P Nov 2008
*4 https://www.dropbox.com/s/jrf9nwxnizjy6ql/M-LOK_Tips.pdf?dl=0 (Magpul MLOC instructions)
*5 https://www.youtube.com/watch?v=tcMqwofYTn0 (Brownells)
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