I was able to install my free float aluminum tube on my 20" A4 today. The install was easier than I anticipated. My question lies with the gas block installation. I found my CCW permit to be about the thickness of the handguard retention "piece" that was removed. I stuck the CCW card between the block and the lip on the barrel. I used two levels, one on the receiver rail and one on the gas block for lateral alignment. Is this a satisfactory installation technique? Thanks!
It should be good as a starting point.
Center your BUIS.
Shoot a group.
Adjust the cant on your front sight/gas block to center the group.
I shoot a Super Sniper, with no iron sights. All I am worrying about is proper rifle function.
Nothing to worry about. Just shoot it.