Installation Instructions

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in position. Tighten one of the set screws, enough to hold the block in
place, but not enough to prevent you from repositioning the block with
light hammer taps.
10. Insert the bolt carrier group into the upper. With one hand, grasp the
upper receiver, holding the bolt carrier group in battery with your
thumb, and stand the assembly up with the muzzle resting on the table.
11. While you continue to hold the bolt carrier group in battery, use your
free hand to move the drive rod up and down, ensuring that there is a
gap between the drive rod and carrier.