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If you are ordering from Bushmaster have them put it on when you order. If not... -Drive out taper pins (left to right) -Pull off gas block -Remove rollpin and gas tube -Install gas tube and rollpin -Install new gas block/tube -Square top of gas block with top of receiver (use machinist protractor or level) -Snug set screws---If you want to set up/use irons -Install irons/Zero rear sight -Test fire and tilt gas block to get correct zero (windage) with rear sight -Final torque/loctite set screws at this time -If not using/fitting irons final torque at step 7 -You can install a sling swivel mt. in one of the set screw holes if you wish |
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