As Ben said +1 all points. I've had a bunch of them in many different combos shooting 22 pellet, 22LR, 22MAG. 22 Hornet and larger in larger cases. Only one was accurate enough to really be useable, a 222/22LR adapter but ONLY when in a 14" barrel (nothing else). You won't be shooting much with it when you see what the accuracy is. It will shoot lower even at short ranges unless you move your sights.