What a waste of research grant
We have this thing in the Army called the EST 2000.
Its a weapons simulator that has recoil, albeit not much because most AR-10 derivatives like the M16A2/M4/M4A1/M100 and such don't really recoil. Your first day on the range and a drill sergeant, usually the smallest female drill sergeant in your training company, will fire it off her head, chest, one handed, etc. Its only a little bigger than a .22, its a 5.56x45mm round which is roughly equivalent to .223. You could fire .223 Remington rounds through it if you absolutely needed to in all actuality. So recoil with that particular type of rifle isn't really an issue and unless you're in a Route Clearance company, or if you're a designated marksman, the AR-10 derivatives are what you'll use. They use compressed air to simulate the round firing, and in all honesty the recoil from the air compressor can be rougher than actually from firing a round. Its sure as hell louder.
It also features a sort of multiplayer, cooperative tactical video game with dynamically scripted variables that can be modified by the operators in real time (For instance, one I recall clearly was a situation where we're defending a bazaar in Iraq from terrorists that were going to try to detonate a VBIED/Car Bomb, and the operators will throw in a moral dilemma, do I shoot the guy that I think has an AK47 under his robes thats sitting there watching the road and one of the entrances to the area or not? Because it may or may not be a weapon and if it isnt, I just shot a dude for no reason, which in the real world is generally frowned upon, the real Armed Forces isn't MW2). Its not for entertainment, the Graphics are about as good as a mid 2000's PC game. It is a very good training tool however because even the operators never see the exact same thing twice.
So no shit, It does actually work.
That being said, I dont get how another University got a research grant to find out the same thing that UCF and MIT (IIRC) both did at behest of DARPA, the Navy, the Army, and the Air Force in the 1990's when they were selling the services on the 1st Generation of the currently deployed systems.