AR 15 TORQUE VALUES

I am always still surprised to see folks at the range or in gun shop having issues with their AR 15 built on the kitchen table with a $20 armorers wrench and no other specialty tools especially a torqe wrench. While it can be done I have never seen anyone build a engine or other precision mechanical device without adhering to a set of standard values especially the torque value of fasteners. I use two to three torque wrenches per AR 15 build but suprising to many on my preccision 10/22 builds I need a minimum of four torque wrenches as have to delve into the inch/ounce range on some of the finer parts. While a milspec AR 15 has a fairly wide rorque range for some fastens but have houng is some of these are refined even more accuracy can be optimized.

AR 15 TORQUE VALUES & SPECIFICATIONS

Torque Values:
Flash hider 15-20 Ft./Lbs. (Other non milspec muzzle devices may use different values so be sure to refer to manufacturers instructions)

Barrel Nut - 30 Ft./lbs. Minimum, not to exceed 80 Ft. Lbs. to align the next slot in the barrel nut.

Carrier Key Screws - 35-40 Inch/Lbs.

Lower Receiver Extension (Buffer Tube)
Rifle: 35-39 Ft./Lbs.
Carbine: Tighten the castle nut to 40 Inch/Lbs +/- 2 inch pounds.

Barrel Nut - 30 Ft./Lbs. Minimum, not to exceed 80 Ft./Lbs. to align the next notch or slot in the barrel nut to properly align gas tube.

Carrier Key Screws - 35-40 Inch/Lbs.

Lower Receiver Extension (Buffer Tube)
Rifle: 35-39 Ft./Lbs.
Carbine: Tighten the castle nut to 40 Inch/Lbs +/- 2 inch pounds.

Head space information For 5.56

New barrel Headspace: GO gauge 1.4636"

NO GO guage 1.4696"

Field/Unsafe barrel Headspace: 1.4730"-1.4736"

This information is provided for reference only www.CoolAR15.com assumes no liability for the use of this information.

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After years of building and repairing uppers along with complete firearms we have realized some people either do not want to build their upper, invest in the required tools for a single custom AR 15 or AR 10 upper, or have built one that has issues and can't seem to sort it out to thier satisfaction. While I have a full time job plus a part time job working as a gunsmith I also build and repair uppers to the clients specifications. If your interested in having a custom AR upper built then please use below email and we will work up a price for a top quality upper built to your specifications or repair your troubled upper whether gas driven or piston driven. I only work on uppers through this site but if have a complete rifle that needs trigger tuning or other work I can provide you with the contact information for the gunshop I do all FFL required work through.