How to Install the SPEAR Free-Float M-LOK Handguard for AR15 - AT3 Tactical

Learn how to install AT3's best-selling M-LOK handguard in this step-by-step video!
The SPEAR requires no timing for the barrel nut, making upgrades or new AR15 builds simple. We'll also show you how to pin your gas block to your gas tube, without the need for a jig.

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Follow along and comment below if you have questions - we're happy to help!

Quick Text Instructions:
1. Secure upper receiver with AR15 vise block. Remove
muzzle device, gas block with gas tube, and barrel nut.
2. Install the barrel nut and apply 30-60 ft-lbs of torque
using the provided barrel nut wrench and a torque
wrench. Reinstall your gas block and tube.
3. Slide your handguard over the barrel and barrel nut
and align top rail with upper receiver.
4. Insert socket head screws from the left hand side of
the receiver, tightening with the 5/32 Hex Key. Torque
to 40 inch-lbs, or 1/2 turn past hand tight. Use the long
end of the 5/32 Hex Key for proper leverage.
5. Insert set screws from the bottom of the handguard,
and tighten with 5/64 Hex Key until they bottom out on
the barrel nut.
6. Your handguard is installed! Install your muzzle
device and reassemble your firearm.

Complete Parts List:
AT3 SPEAR M-LOK Handguard, 12", FDE Cerakote
Ballistic Advantage 16" Black Nitride M4 Profile Barrel, 5.56 NATO
Aero Precision Forged Upper Receiver
AT3 .750" Diameter Low Profile Gas Block
AT3 Carbine Length Gas Tube
AT3 Combat Flash Hider with Crush Washer
AT3 Black Nitride 5.56 NATO Bolt Carrier Group
Radian Raptor LT Charging Handle, FDE

Tools We Used:
Bench Vise
Magpul BEV Block
Wheeler FAT Wrench
Loctite 242 Thread Locker
5/64" Roll Pin Punch
Adjustable 1/2" Drive Torque Wrench (Ft-Lbs)
1/2" Drive Breaker Bar
Needle-Nose Pliers
Tongue-and-Groove Pliers
Allen Wrenches
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