Most any trainer type will barrel roll very nicely however just using aileron is not going to do. You also have to add rudder with the roll and don,t forget to add momentarily a touch of down as you approach the inverted postion. Its at this inverted portion of the roll where most panic and stop rolling with the ailerons That's usually not a good idea as the normal result is a panic pull of up and a figure 9 into the ground. keep the pro roll aileron and rudder until the maneuver is completed.

John