According Marine Corps Times - Upgrading M16A4

[cory]

" Those effects are magnified indoors, which means they would be especially unpleasant and potentially injurious when clearing a building or compound."
I would think the accuracy benefits would not be needed at close range indoors which suggests that a compensator with a rotating sleeve which could close it off would be worth experimenting with. Twist closed, twist again open.
Is that possible?

Not to diminish your idea, because in theory it's a legitimate solution.

However, in practice this would be asking shooters to reach down, grabbing the muzzle of the barrel of a loaded rifle just before entering a building with their adrenalin pumping.

This compensator idea is an attempt to fix a "problem" with the weakest 10%. Recoil on a 5.56 is a non issue. As far as aiding the shooter in reacquiring the target quicker, a vertical grip will work just as well.

Bwaites had the perfect solution, mini suppressors. I've got many of exgf that wishes I had been issued a suppressor, so I could hear half of what they had to say. On second thought forget the suppressor I'm glad I wasn't issued one. hahahahahaha

I'm all for giving my grunts better rifles! However, within 300 yard firefights and CQB have to be the first priority. We shouldn't be making that job harder.

For the 500+ yard engagement, we should be focusing on a 6.5 Grendel LMG and DMR.