Failure to eject/ bolt stuck

[FLshooter]

Simple,easy way to align a gas block.Once you have your barrel on and tightened,install your gasblock and tube.Leave the set screw,so that you can move the block.
Take a 2” length of aquarium hose or car vacuum hose(1/8”,attatch it on the gastube through the upper. Blowing through it you’ll be able to tell when it’s aligned,then just tighten the screws.Success!