AR-15 forend tube (handguard) can be user-installed or it can be done
by a gunsmith. The following is a general guide and may vary to the
Tools: Proper sized pin punch and hammer, AR armourers wrench (if you
need to remove the existing barrel nut from your upper receiver), proper
action holding block and Hogue black gun wrench (included).
Before starting, make sure rifle is unloaded. All operations must be
carried out in a manner that will not damage or mark the rifle.
2. Remove existing gas block and forend per manufacturer's instructions.
Separate the Hogue tube by un-threading the barrel nut, separating it
into two pieces. The Hogue Black Gun Wrench (included) and a proper
AR-15 action block are recommended to eliminate the possibility of
damage to the tube or your rifle.
Lubricate the threads on the barrel nut and on the surface it will
tighten against. Hand tighten the barrel nut and then tighten according
to the instructions below.
5. Follow type A for specific instructions:
Low Profile Gas Block, with Extension Tube, with AccessoryAttachment:
Install the low profile gas block and gas tube. Make sure the jam nut is
screwed all the way onto the extension tube. Screw the Extension tube
onto the barrel nut until it stops. Back the extension tube off until
the first row of threaded holes lines up with the center of the upper
receiver rail. Tighten the jam nut against the barrel nut making sure
your alignment does not change. Screw the forend tube onto the end of
the extension and tighten. Go to next step.
6. Check for proper function and test fire the rifle.
Use Instructions For The Hogue Black Gun Wrench
The Hogue Black Gun Wrench that is supplied is made out of an extremely
strong and durable polymer that will not break under normal use.
Required safety equipment consists of safety glasses and set of work
complete wrench is comprised of two parts labeled wrench A and wrench
B. The wrench fits two different dimensions: 2" diameter for the barrel
nut and 2-1/8" diameter for the extension jam nut. There are
directional arrows moulded onto the surface labeling which directions
the wrench should be turned.
To install the barrel nut first remove the charging handle and bolt
carrier group from the upper receiver. Second, remove the existing
barrel nut. It is important to lubricate the threads and bearing face of
the Hogue barrel nut and the flange face of the barrel extension with
assembly tube. Third, clamp the upper receiver into a vise using an
upper receiver vise block and remove the existing barrel nut. It is
important to lubricate the threads and bearing face of the Hogue barrel
nut and the flange face of the barrel extension with assembly lube.
hand tighten the nut onto the receiver and inspect the gas tube hole
alignment. One hole in the barrel nut must be aligned with the hole (1)
in the the upper receiver for the gas tube to pass through. If 1/4 or
more of the upper receiver hole (1) is exposed through the barrel nut
hole (2) it is recommended that you bypass that hole and rotate the nut
to the next one (3). This will properly torque the nut within the
desired specification of 35-85 ft lbs.
To attach the wrench to the barrel nut, insert the arm of the 2 inch
side of wrench A into the centre opening of wrench B. Leave the arm of
wrench A resting outside and below the opening of wrench B.
the tool over the barrel nut knurling observing the directions of the
arrows on the tool. Lever the opening of wrench A over the arm of wrench
B making sure that both parts of the tool are properly aligned. This is
purposely made tight so that the wrench has maximum hold onto the
barrel nut. To rotate the nut, first apply force to wrench B. As you
tighten the nut, constantly check the gas tube hole alignment. If the
nut will not tighten any further, loosen then tighten the nut a few
times before the final hole alignment. If you bypass a hole you must
proceed to the next one for proper toque.
To remove a Hogue barrel nut, reverse the direction of the tool. For
the extension lock nut, use the tool in the same manner using the 2-1/8"
the tool slips on the knurling, get a piece of emery cloth and place it
between the tool and the barrel nut with the abrasive side facing the
part number information: 'Hogue 15068 - Knurled Aluminum 8" OAL 3 Gun
Free Float Forend Extension'