I had been using a .30 cal Shogun on my .25 Maverick Compact. It works well but would not allow the 580cc bottle to fit. The .25 Koi works great and surprisingly seems less noisy than the much larger volume .30 Shogun, maybe due to the larger bore size on the Shogun. With the 580cc cylinder it is a close fit but does not cause any POI shift compared to the 300cc bottle. It is an impressive little can!