The A-400 uses the Beretta Optima HP style choke tubes. We do make Black Cloud chokes for this choke system. The MR is item#09016, the LR is #09017, and the 2-pack with both MR & LR is #09140. Please note the HP chokes are made from a Carpenter 455 Steel which is a stronger steel than what we use for other choke systems. This steel is needed due to the thin wall design of the HP choke system. The chokes will be a higher price compared to other BlackCloud choke tubes.