Leapers PRO AR Pistol 4 Free Float Quad Rail System (MTU008) - Manual (Page 6)

Place the barrel on a well padded flat surface
securely. Punch the two pins at the bottom of
the front sight out with a hummer and a punch.
Remove the Front Sight with the Gas Tube,
and take out the Front Cap.
5
Clamp the upper receiver on a vise with an
AR15 upper receiver vise block. Loosen the
barrel nut by turning it counterclockwise with
an AR15 barrel nut wrench. Take out the
original barrel nut with the delta ring assembly.
6
9
Release the 4 locking screws by turning them
counterclockwise with the included Allen
wrench, and take out the free floating barrel
nut from the handguard assembly.
7
Fit the free floating barrel nut on the upper
receiver, and tighten it with enough tension.
Make sure that one of the through holes on
the barrel nut is aligned well with the hole on
the upper receiver for the gas tube to pass.
8
10
Max. torque value for
installing barrel nut
should not exceed
60ft.lbs.