Installation Instructions

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1. The first step in aligning the gas block has already been taken during
the gapping process, when the upper was laid on the table and the set
screw is tightened while putting downward pressure on the barrel. As
long as this was done on a level surface, it creates a good starting
point. Look down the top of the upper receiver over the top of the gas
block to see if it is visually canted to one side or the other.
2. If the gas block is canted, use light hammer taps with a nylon or plastic
hammer one the side of the gas block to bring it into alignment
3. Ensure that the drive rod can slide freely. To do this, grasp the upper in
one hand, with the muzzle resting on the table. Pull the drive rod up
towards the upper receiver. You will feel resistance from the drive rod
spring, but the drive rod should not bind or stick. When you release
the drive rod it should spring back down into position.
Note – some drive rods may not be perfectly straight, which can result in failing
the binding test. However in these cases, you should be able to rotate the drive
rod to find a free spot where it will drop correctly. As long as there is a position