Scratch my previous statement about barrel design. It seems these are made for smoothbore, and are essentially an FSDS with moving fins unlike the copper-head and excalibur projectiles.
I could see first use of these being applied to IFV's and MBT's in order to ensure first-shot hits. Take the 25mm off the M3 Bradley, replace it with a smoothbore version with a laser designator, and now every single shot hits the target no matter if the target suddenly jinks throwing off your lead, or the wind sudden gusts hard, etc. This wound also significantly extend the accurate range of the Rheinmetall 120mm.