This is eight double rounds [.45 ACP] with the Arsenal Firearms 2011 Second Century Double Barrel Pistol…in other words, it is 4000 grains of payload sent downrange in about 5 seconds. To achieve the same result with a single barrel 9mm pistol we would need to shoot about 30 rounds, with two changes of magazines, in about 30 seconds. This is performance… CONTINUE . . ! I like it!