Damian wants Poland to equip the IA.
Well why not, I know that MSBS have increasing interest in USA, and overall it is more modern and more progressive firearm than most other of it's analogs, if not all.
Also products of Fabryka Broni Åucznik have a very good opinion in USA for their quality and reliability, I know that for example AK's made by FB Åucznik are considered as higher quality and more reliable than AK's made by other manufacturers, so definetely MSBS will also be very reliable (it must be, Polish Army had been using AK's for a very long time, thus reliability of new firearm needs to be at least same) and high quality product.
Also take note that MSBS can be reconfigured from classic design in to bullpup and vice versa with simple tool pack. Which means a commonality of components between the two variants and their specialized subvariants, thus reducing costs of procurement, improving logistics etc.
In such case MSBS can replace probably 80 to 90 % of other types of firearms in armed forces. So you can issue standard versions to infantry and bullpup to the special forces, security forces, rear eshelon units or for example vehicle crews and pilots.
Also take a note that MSBS of course have currently only 5,56x45mm version, but later 7,62x51mm will follow and 7,62x39mm and 5,45x39mm as well as 6,8mm versions might and probably definetely will be designed because weapon design is 100% modular.
So MSBS in the end might estabilish a new trends in firearms designing, if hopefully it will be successfull design.