Maintenance Instructions

10044S
Colt Canada Proprietary 3-2-17 2005-09-20
NOTE
The barrel nut is correctly installed and aligned when the alignment tool passes freely
through the assembly and is centred over the barrel.
16. Finish reassembly of the upper receiver and barrel group by installing the gas tube and
handguard assemblies by the following procedures:
a. Remove the assembled upper receiver and barrel from the vise and install the gas tube
assembly as follows:
(1) Insert the rear of the gas tube assembly through the barrel nut assembly into the
upper receiver;
(2) Rotate the gas tube assembly to align it with the hole in the front sight;
NOTE
The gas port in the gas tube assembly will be on the bottom when the gas tube is correctly
aligned.
(3) Insert the front end of the gas tube assembly into the front sight;
(4) Align the retaining pin holes in the tube and front sight; and
(5) Secure the gas tube assembly with a new gas tube pin.
NOTE
Replace the gas tube pin whenever the gas tube assembly is replaced as the pin may
have been heat affected in use.
b. Assemble the handguards to the upper receiver and barrel group as follows:
(1) Support the upper receiver and barrel group vertically on a work bench with the
compensator pointing upward;
(2) Pull downward on the handguard slip ring;
(3) In turn, push the forward ends of each of the handguard assemblies up into the
handguard cap and swing the rear end of the handguard assembly into place; and
(4) Release the handguard slip ring, ensuring that it engages the handguard assemblies
effectively.
c. Assemble the RAS to the upper receiver and barrel group as follows:
(1) Depress the retaining clip and slide the top RAS hand protector forward;