Wipe upper receiver thread clean and ensure there are no burrs. Apply molybdenum disulfide grease to the threads before installation. This operation must be done in order to make later removal of the barrel easier.

(a) Position rifle barrel assembly (2) with alignment pin (6) up. Using barrel removal fixture, clamp barrel assembly (2) in vise.

(b) Align upper receiver assembly (7) using barrel alignment pin (6) and the slot in upper receiver assembly (7). Install over end of barrel assembly (2).

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