How to Install the SPEAR Free-Float M-LOK Handguard for AR15 - AT3 Tactical
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Published 2020-01-30
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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All Comments (21)
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shout out to the Real Avid Lug Lok AR-15 Upper Vise Block which gives you plenty of capability against an over-torqued PSA barrel nut
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One thing I do is use a plastic picatinny hand stop or rail to bridge the hand guard/upper to perfectly align the hand guard to the upper before tightening those barrel nut bolts
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I like that trick with the gas block, I’m gonna use that next time
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Debated having a local armorer install it due to time constraints. But nothing like building your own. having bought a bare bones left-hand upper, I didn't install the gas block and tube. But I needed a handguard installed. This vid helped me do that. Good stuff, AT3.
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Watched for gun assembly reasons. Enjoyed for concise step-by-step. Liked for Meteorite ring.
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I purchased the handguard, magpul stock and grip. Putting them on today to finish up my first build.
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I’m stoked to put mine on this weekend! Thanks for the video!
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I can vouch these handguards are top notch!
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Great video and the GB pin went in perfect! I will try this just before installing your rail, which i will oder this weekend!!! Thanks for the video.
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Thank you Watched 4 other install of Free-Float M-LOK Handguard for AR15 and none of others showed where all the bolts are. Could not get it off until you showed the small ones recessed for holding onto the barrel.
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Great instructional video. Thanks.
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I’m here because Randy is coming here. And my wife says this guy could definitely be Ryan’s son. Good luck on growing this channel!
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Just ordered the Handguard. Thanks for the informative vid.
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Awesome video very well detailed
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Great instructional and demonstrational video on AR-15 upper assembly. Thank you!
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I just bought there slick side upper and it's just a well made as my aero percision but looks better.
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Good video
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I would like to try this handgaurd in a 12" on a build I'm currently working on.
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I notice in different images online that there are 2 versions of set screws. Why? Which is newer version? Thanks
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Do I have to have a anti rotation slot on the lower receiver to install this and hand guard on my ar15 pistol
