6061 T6 Construction, Type III Black Hard-Coat Anodized. CNC machined lightweight one-piece free float design. Aluminium barrel nut allows mounting of up to 1” diameter barrels.

ERGO Modular Free Float Rail System Features:

M-LOK® Compatible Slots accept ERGO and all other M-LOK® accessories
Aluminum Barrel Nut included
Accepts Ergo WedgeLok® Rail Covers
Full-length, scalloped Mil-Spec 1913 Picatinny top rail
1.8” inside diameter to accept most suppressors
For AR-15/M16 platforms (Not AR-10, SR25, etc…)
Uses a standard barrel nut wrench

Installation instructions:

Clean and inspect the upper receiver, barrel and barrel nut.
Place the receiver in a proper vice block.
Coat threads with grease or an anti-seize compound.
Install the barrel into the receiver. Be sure to align the indexing pin with the slot in the upper receiver.
Slip barrel nut over barrel and thread onto upper receiver hand tight.
Using a standard USGI barrel nut wrench, torque nut to 30-50 ft-lbs. Check the alignment of the gas tube hole in the upper receiver. You may need to loosen and tighten the nut once or twice to get proper alignment and torque.
Install gas tube and gas block, per proper instructions.
Slip the handguard over the barrel and gas block.
Align screw holes in the handguard with holes in the barrel nut.
Start all screws before tightening any of them. We recommend a blue thread-locking compound.
Make sure everything is aligned properly and installed correctly.
Tighten all screws.
Enjoy your new, state-of-the-art handguard.

Tools required:

USGI barrel nut wrench
3/32” Allen Wrench

Ergo Modular Free Float Rail System 12 Inch - Black

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