Howdy,
The Revolving Carbine isn't legal for a SASS rules match. A main match rifle has to be a lever or slide (pump) action feeding from a tubular magazine. That being said,it's possible that your local match my let you shoot it, If you do,you would be handicapped by the fact that you could only load 5 rounds into it,but most stages call for 8-10 rounds fired from the rifle,so you'd be forced to reload on the clock.
Besides all that,revolving carbines are really cool little guns. Gunsmith and trick shooter Bill Ogelsby has one that he modified with a pump forearm that cocks the gun and turns the cylinder. You can hold the trigger back and let five rounds go downrange in a very short period of time.
Bellicose Bill