Below is a list of torque values as a reference for anyone who is building or intends to build an AR-15
Compensator (Flash Suppressor) – 15 to 20 Ft. Lbs.
Barrel Nut – 30 Ft. lbs. Minimum, not to exceed 80 Ft. Lbs. to align the next slot in the barrel nut.
Carrier Key Screws – 35 INCH pounds to 40 INCH pounds.
Lower Receiver Extension (Buffer Tube)
- Rifle – 35 to 39 Ft. Lbs.
- Carbine – Tighten the locking nut to 40 INCH pounds plus or minus 2 INCH pounds.