Thank you for your normal constructive advice I'm sure the OP will gain necessary information to resolve his problem following such detailed information.
If you actually have to shoot at another human being, you'll never notice a little noise or blast,
For the OP: I cannot understand your complaint, the AR with issue flash hider is not designed to send concussion, flash or sound back to the shooter. As indicated there are many hiders and muzzle brakes available to mitigate flash and recoil normally at the expense of increased sound, I have found the Daniel Defense flash hider to provide all I expect from a muzzle device but there is no cure all (flash, recoil, noise and muzzle rise) in a single package that I am aware of. It is unfortunate that you are so intimated by the perceived muzzle flash/blast that you would consider adding pipe to the weapon, perhaps you should follow suggestions to remove the hider and add a thread protector (or not) and fire the weapon in this fashion.
I don't think simply removing the A2 flash hider would do much to lessen your problem. There are a number of products out there that are supposed to direct the blast downrange ...
Silencers? As much as they cost, along with the additional $200 to the government, and then having to basically register myself with the government--I don't like that idea. Although the idea of having one is most certainly appealing, I think the burden is too high.Are silencers an option for you?