I've used my MSAR-556 AUG clone in several 3-gun matches (mostly for fun)and it does have certain advantages. It's light, compact, fairly accurate and with a 20-inch barrel it's shorter than an M4 carbine. Trigger pull isn't an issue as company called Ratworx is making a drop-in hybrid trigger pack that will use standard AR-15 trigger parts and is tunable just like AR rifles. The AUG can be fired left or right-handed with a bolt conversion or weak-handed with strong hand as an improvised brass deflector. Mag changes are slower, but I use Steyr 42-round magazines so it kinda evens out.