Great rifle. Only problem I've ever had with mine was shooting Wolf ammo with the gas setting too low. Reset made the problem go away. The internals are a little more robust than the AR's. Very reliable and easy to keep clean. Accuracy is very good as are the ergonomics. It is a little heavy, but you put a Quad rail, grips,laser/light, etc. on a standard M4 and the weight jumps appreciably.All in all it is an excellent weapon. As to whether it is better than an AR, I think its design is more robust. Accuracy and ergonomics are about even. Durability goes to the XCR. Ease of maintenence goes to XCR. Don't get me wrong I like my AR and shoot it often, but IMHO the XCR is a better weapon.