This might be fine for a light tank, but I don't like it in a mechanized Infantry Fighting Vehicle. We already dropped from carrying a squad to a fireteam with the Bradley, a gun like this would leave even less room inside. I would rather see, a remote control turret with a bunch of Javelin Fire & Forget missiles and a heavy MG and the crew sitting down inside, along with a full 11 man squad. Video games have made to day's troops comfortable with viewing the battlefield from a display, rather than on top with their own eyes, this provides much greater protection.
If you look at attempts to mount a cannon on the Striker (APG), it always fails when they fire from the side and recoil flips the Striker over. Javelins are F&F, they require no operator based guidance, you simply ID the target to the missile (you are looking through the missile at that point), and fire. There is no need for sophisticated guidance or acquisition systems on the vehicle for the Javelin. The Javelin was developed in the 1980s with leading edge (and at great expense) technology that is in everyday civilian use now. Yet, there has been no competitor, no rival with our Javelin's capabilities. The most expensive part on the original Javelin was the 64 pixels imager. Mega pixels imagers cost pennies today. Next technical hurdle was the requirement to cool the thermal imager, yet today we have non-cooled imager technology. A new development of the Javelin would seem to be in order, utilizing low cost materials and scalability. A scaled down version of the Javelin could be used on small drones, slightly larger version for shoulder firing, an even larger version for vehicle mounted missiles, and even a larger version that could be burst, releasing dozens of these missiles to attack second echelon forces. The seeker being gimbal mounted and operating in the thermal frequencies, could even be used for acquisition and fire control. The current 64 pixel seeker can see at least twice the range of the missile, imagine what it could do with a giga pixel imager. Imagers are today so cheap that a staring array (large number of stationary imagers tied together with software into a single coherent display), sort of like an insect's eyes, is very affordable.